B21 pistons in a B20

[Oilline]

Has anybody had experiance of fitting B21 pistons into a late 8 bolt B20?
I was wondering about where to get a head gasket to suit the increase in
bore diameter. Also where to buy a set of original quality Mahle pistons.

[amazon69]

Lots of guys on brickboard run these in their motors, just been reading about the idea.. might be worth you asking there..KGTrimning do the mahle pistons, as do cvi automotive.
hth
d