Adam,
 Try Dave Reed (Otto Gas Engine Works) next time for your gasket sets. Dave&#039;s handy for me as he&#039;s only a mile from the house and is open on Sundays. He does ship all over the world. Dave also specializes in rings and can set you up for cheap. 

Dave&#039;s Phone # 1 410 398 7340      

Sounds like maybe your sleeves were a little too far gone for this but I have another neighbor 1/4 mile east of me who works w/ ceramics. If your sleeves are pitted, Paul Grey, has came up with a compound to fill the pitts and then hone the sleeve to specs. Don&#039;t worry Paul knows what he&#039;s doing he has a doctorite in that stuff And it does WORK!!!
        I think he will do it for &amp;quot;outsiders&amp;quot;. I THINK he probably will. May want to mention my name.
Pauls # 1 410 392 0812

Last set of sleeve seals I needed I took the sleeve to our local New Holland dealerships parts counter. Told them to fix me up w/ O-rings close to the size. They measured and  ordered, came back with the right ones, complete set for around $20.  I now remember it was a 77, I needed them for. 

As far as sheet metal goes......I just do the best I can with what I got. Before buying after market.   Sometime turns scarey!!

Danny Tabor #747