Iv called a fantic parts specialist up and the only pistons he has are A,B and C.
Im half tempted to polish the parts up and rebuild it and enjoy it as it is! It runs mint - there's no blow by just a bit of a rattle that I can live with.
Maybe do this until something goes wrong and go the full rebuild if anything happens down the line.
Unless I can track down a D piston, what you'd you guys reccomend?