Unknown Soviet rocket material

[US-Subs]

Looking for an ID on these two pieces. Reportedly came out of Vietnam in the late 1960s, likely of Soviet origin. First piece (pix 1-3) is approximately 22cm (8.6") in diameter, appears to be set up for aircraft rail delivery.

Second piece is motor only, 20cm (8-inches) in diameter (4). I got the pieces together, along with some other Soviet rocket material. Hoping that some of our members from the East may have some ideas. Ruler is 48" (122cm) Anyone?

 

[BOMBSaway1980]

The second picture is a USSR 200mm rocket motor for the BMD 20 reference is on the way.

 

[US-Subs]

And the first? Don't stop now, you're on a roll! When I first found it I thought it was a warhead section for the 200mm motor, still not sure.

 

[BOMBSaway1980]

taking a stab in the dark on this one from left to right RS-82, RS-132, M-8 and M-13