Cyl/piston/rings tolerences EC 300 2009

[TheEfterbliven]

Hello!

New to the forum, hoping for some help.

Bought myself a 2009 EC 300 Racing. Doing her ready for the spring.
So disassembled the jug so i could see what parts to be ordered, but ran into some questions.

I got a A cylinder and A piston(71.93 mm).

Measured the ring gap to be 0.3 and 0.4 mm, manual says 0.5 mm and a maximum of 0.8 mm.

So i put the piston in the cylinder and saw that the upper part of piston seemed to be smaller than the lower part, is that normal?

Used a feeler gauge and got 0.25 mm play on upper part, and 0.05 on the lower.

If i turn the piston up side down i get the same readings (top of piston in bottom of cylinder and vice versa)
So the piston seemed to be like a cone.

Now, both piston and cyl looks very nice, ordered a piston from spain but got insecure in case i need to cancel that order.

Ordered a C? 71.95 mm piston. Have a feeling that the bike itself have atleast a couple of hundred hours on it.

So, do you guys Think i need A, B or C piston?