Any spare volvo [VW /Audi] diesel heads out there

[the caveman]

I got a good customer in the shop who just had his belt break. I have searched but there aren't a lot of exhaust valves out there if i need. If i can find a dececnt head i may just throw that on for him. Anybody have some secret sources for those motors? I haven't even taken the valve cover off yet to see what kinda mess there is.