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I've read though a few posts on piston ring sizes when fixing dropped valve seat. I've run into the same issue a couple others experienced. After measuring piston rings (which I should have done prior to ordering my parts), I found that I have the first design pistons with ring sizes 1.2, 1.5, and 3.0. I jumped the gun and ordered what was noted as standard ring sizes 1.5, 1.5, 3.0. Now, coincidently, I thought ordered just one new piston, but turns out I ordered the set that matches the new ring set.

If I replace all pistons, is there any issue with going from the first design which has a top ring size of 1.2, to the second design (new pistons) which will change the top ring size to 1.5?
 

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As long as piston groove matches ring size you will be fine.
 
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