Excellent, thanks Chris.
The top image is indeed a D-3 and the bottom a G model with 37mm fixed anti-tank cannons.
I already had that image of the D-3 but have decided to use it now. Maybe someone could confirm that it is:
Unit: Stab II/SG 2 'Immelmann'
Serial: T6+BC (W.Nr.2491)
Served in the autumn and winter of 1942 in the Stalingrad area. Gruppe 'Der Bamberger Reiter'.