I may be able to get my hands on a few NOS 74cc Autisa cylinder kits complete with everything including head, all in original boxes.
It's the alu/nicasil version with reed valve, like in the picture but they're not painted black.
The price would be around $570 plus shipping from Sweden, it's hefty I know but its almost as rare as hens teeth and nearly impossible to come by.
I don't have them in my possession at the moment so if there's an interest, it'll take at least a month before I can ship them, I'm still negotiating with the vendor and he's an old fart...
Drop a line if you're interested.