Please change all GAZ SU-76 to GAZ SU-76M https://www.imcdb.org/vehicles.php?make=GAZ&model=SU-76&modelMatch=1&modelInclModel=on with the exception of this one https://www.imcdb.org/vehicle_460879-GAZ-SU-76.html

The SU-76 without the M was a pre-production model and had an enclosed crew compartment. Every SU-76 on the site is an SU-76M, with the exception of that one.