This guy might be usable;
http://www.ebay.co.uk/itm/1-35-Scale-Resin-kit-German-tank-crewman-WW2-Set-4-EM35075-/301204936030?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item462136955e
Or the guy on the left in this set;
http://www.ebay.co.uk/itm/1-35-VERLINDEN-German-Infantry-at-Rest-resin-kit-/121357049537?pt=Model_Kit_US&hash=item1c41719ec1
There is one other shirtless tank crew figure I can think of but he's part of a set of about 12 resin figures and the set is £100+, not something I'd recommend for the use of one figure lol. none of them are Afrika Corps either, but if you're placing the guy inside a Tiger cupola, you'd never see his pants anyway. you could even drill off his legs and replace them with a set of legs from one of Dragon's DAK sets of figures if his legs were going to be visible.
Hope those help!
Cheers,
Jonny.