I screwed up the designators...this is hard stuff. It should be the 8U218 TEL with R-11M. The R-17 missile was the follow on to the R-11M and the 2P19 was designed to carry it as the development of an improved TEL was going on with the improvement to the missile systems. Then the R-17 was put on the new 9P117 wheeled TEL and both TEL and missile were improved to eventually produce the 9P117M1 and R-17M.
So, in short:

8U218 and R-11M = Scud A (popular nomenclature)
2P19 and R-17 = Scud A (popular nomenclature)
9P117 and R-17 = Scud B (Popular nomenclature)

There is more to this. I suggest getting Zaloga's Scud Ballistic Missile book from Osprey as a start if you want to delve into it.

FWIW the Fahrzeug Profile I have on the Scud in NVA service refers to the 2P19 with R-17 as the "SS-1c Scud B" as does the Zaloga book, (p14).

HTH
Andy

Yeah, Popular Nomenclature does not mean correct nomenclature. If I was not clear before, the SCUD-B refers to the Missile system using the NATO designator. The SS-1b and SS-1c are US designators for the entire complex, Missile and TEL.

Even the Russians has fun with this mess, as the 2P19 and R-17 were collectively the 8K14 Elbrus. The 9P117 with R-17 was called the 9K72 Elbrus.

Call it what you want, it should still be a good model to build and is welcome. Tomato, Potato.