Peugeot used the metal/fiber head gaskets on their liquid cooled SPX/RCX- at least the ones we've had
Roughly 65cc of displacement
You'll have to track down your own o-ring to seal up the outer edge of the head
If you're having to rebuild your A55
The classic DR and Proma combo
Peugeot Athena 46mm "70cc" Cylinder Kit dmp Peugeot used the metal/fiber headClassic 46mm Athena kit for Peugeot 103, 105, SPX, RCX, Fox, and Honda Wallaroo. Large side transfers and L shaped top ports. Piston is single ring with a window. Aluminum with nikasil plating. Based on the discontinued Eurocilindro kit. I see a lot of case matching in your future. Comes with cylinder, piston, ring, pin clips, and gasket set.