[zastava128]

I know you have a lot on your plate, so these are my final OOB-related suggestions until the next version comes out (for both WinSPMBT and WinSPWW2):

unit 035 (M8 Greyhound) - this isn't present on an inventory report from 1948, and I've not seen any indication it was used in WW2. I think that it's therefore logical to assume these arrived in 1951, with the other American gear.

unit 529 (M3 Halftrack) - same comments as for the Greyhound. The only comparable vehicle available before 1951 that could fill the gap would be captured SdKfz 251s left over from the end of WW2 (could be copied from obat43, unit 120).

M8 HMC, present in WinSPWW2's Yugoslavia OOB, was still in use for a while after the end of WW2 (probably around 1960 or so).
-could be copied from, say, obat06 unit 42

(source for all these is the same book mentioned in the OP)

And that will probably be it for this OOB anyway - it seems quite accurate now.