For the guys running some kind of oversized OEM pistons (stock h22 or type s), how did you fit them in your cylinders? Were your cylinders already that size? Did you get them bored out?

I'm trying to put Type S pistons in a block with all B sized cylinders and can't find B sized pistons anywhere. So now i'm considering just boring(if possible) to use oversized pistons. Thanks for the help guys.