The exact center bore? 63.1 mm or 64 mm?

[Jeroens]

Can someone tell me or better measure the exact center-bore please. There are different numbers floating around and need to know if '63.4mm' fits...

 

[FlasherZ]

Can someone tell me or better measure the exact center-bore please. There are different numbers floating around and need to know if '63.4mm' fits...

0.6mm likely won't be a problem. That's 24 thousandths of an inch, less than the gap on an ICE spark plug. Just give it a little extra "love" and it'll pop right on.