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WW2 mortars in Czechoslovak army were completely replaced by new types by early 1960s. By that time these types of towed mortars were available:

82mm mortar vz. 52
- in service from mid 1950s
- during artillery reduction in 1960s withdrawn from infantry units but stayed with airborne troops well into 2000s

120mm mortar B24 (sometimes designated also vz. 52)
- in service from mid 1950s
- withdrawn completely during artillery reduction, completely eliminated probably in early 1970s

160mm mortar obr. 43 (local designation vz. 43)
- in service from 1950s, domestic licence production
- withdrawn probably in early 1970s

When planning for atomic war become the only option in early 1960s the army significantly reduced conventional artillery including mortars. Infantry units (except airborne troops) lost all mortars. Once conventional warfare become part of planning again in second half of 1970s the army started to boost artillery units again. This led to interesting organization of motorized rifle battalions which got platoon of two RM-51 rocket launchers. These were replaced by new mortars in second half of 1980s:

120mm mortar vz. 82 PRAM-L
- in service from 1986

During 1980s also self-propelled mortars were coming:

ShM-85 PRAM-S
- self propelled variant of PRAM-L
- only 12 produced in 1990 in testing series with cancelation of further production due to end of of the Cold War
- the 12 vehicles were not deployed with units initially but were stored and only after dissolution of Czechoslovakia were later deployed with active units

2S4 Tulpan
- one battery equipped with 2S4 delivered from the USSR at the end of 1984
- withdrawn in early 1990s

Very interesting. Mortars withdrawal is an interesting decision, probably even unique as I am not aware of such drastic cut to infantry support elsewhere.

I have two questions. First is if there are any firing tables available for those mortars, for obtaining minimum range and max range particularly of illumination and smoke shells?

Second question is 2S1 Gvozdika, was it delivered in 1976 or later?

82mm mortar vz. 52 (Škoda B22) I have range data 80 to 3540 m.
120mm mortar B24 (Škoda B24) range 460 to 6750 m.
120mm mortar vz. 82 range 250 to 8000 m.

Czechoslovak army indeed got first 2S1 in 1976 when equipment for one battery was delivered. Next deliveries continued however only after 1981.

Similarly to mortars also anti-tank guns left in service in mid 1960s were of post-war origin:

85mm anti-tank gun vz. 52
- dual purpose gun which can be used also for indirect fire
- stored at the end of 1960s and completely withdrawn in second half of 1970s
- uses same ammo as T-34-85 but due to longer barrel the muzzle velocity is slightly higher

100mm anti-tank gun vz.53
- dual purpose gun which can be used also for indirect fire (and often used in that role)
- in active service till early 1990s then scrapped
- uses same ammo as SD-100/T-54/T-55 but due to longer barrel the muzzle velocity is slightly higher

The last one which stayed in service longer than others is casemate gun deployed in modernized pre-war fortifications:
85mm fortress gun vz.44/59
- based on gun from T-34-85, uses same ammo
- from early 1960s deployed in pre-war heavy fortifications in southern Moravia (to 1999) and in Bratislava (to 1970s)

One more thing:
82mm recoilless gun vz.59
- in service to early 1990s
- from second half of 1960s mounted on OT-62D and OT-810D but still possible to dismount it

Czechoslovak army had large number of various types of towed artillery after ww2 including British, German, Czechoslovak and Soviet types. At the end of 1950s and early 1960s the artillery holdings were standardized around few main types.

122mm howitzer vz. 38S (licence production of soviet M-30)
- in service from late 1940s to early 1990s
- modernized in 1970s to vz. 38/74

122mm gun A-19 (Czechoslovak designation vz. 31/37)
- in service from early 1950s to early 1990s
- delivered from the USSR

122mm gun-howitzer D-30
- in service from 1981 to 2000s
- delivered from the USSR

130mm gun M-46
- in service probably from 1976 to 1990s
- delivered from the USSR

152mm howitzer vz. 18/47
- post war production of German sFH 18 in 152mm
- in service to early 1990s

152mm gun-howitzer ML-20 (Czechoslovak designation vz. 37S)
- delivered from the USSR
- in service from late 1940s to early 1990s

Self-propelled artillery was in service in late 1940s and early 1950s where German ww2 models and Czechoslovak prototypes were tested and deployed in small numbers. During standardization in late 1950s was however self-propelled artillery cancelled. This reorganization was significant because it included also stored weapons for mobilization.

New self-propelled artillery comes in 1970s:

2S1 Gvozdika
- one battery delivered in 1976 with further deliveries in 1980s

ShKH-77 DANA
- in service from 1980

2S7 Pion
- in service from 1984 to early 1990s
- only two batteries delivered

Finally rocket launchers. There were only two types in post-war Czechoslovak army:

RM-51 (130mm rocket launcher vz. 51)
- in service from early 1950s to early 1990s
- its 130 mm rockets are of domestic origin

RM-70 (122mm rocket launcher vz. 70)
- in service from 1971
- unarmoured variant is RM-70/85

Out of interest balistic missiles which were in service in Czechoslovak army were FROG-3, FROG-7, SS-21 and SCUD A, SCUD B, SS-23.

I guess that due to that peculiar organization of motorized rifle battalions caused by artillery reduction, we might see first on-map MRLS in game.