First time looking at top end... cylinder is std bore, and the rings seem to be about 1mm past the spec limit. I'm not certain, but aren't over size rings for oversize bored cylinders? If my piston is 66mm than a standard size ring is the only one that can go on it and should go on it.. correct?

Also I checked ebay and they only have oversized rings. Where and about how much should these standard rings go for?

Thanks!