Sturmgeschtz 40 G

The Ausf G was the last production series of the StuG. rolling off the assembly line in December 1942, the Ausf G was produced until the end of WW2, with no major design changes. In 1942, the decision was made to use Pz Kpfw III Fgst for StuG production, since the Pz Kpfw III was being phased out and replaced by the Panther.
In response to this request, 165 Pz Kpfw III Ausf M Fgst were used as chassis for StuG Ausf G, with production from february to November 1943. In 1944, 173 Pz Kpfw III, returned to the factory for overhaul and were converted to StuG Ausf G

I take it the armourment is a 88mm

no only 75mm