Piston Question

So, I checked and both pistons have comp height of 1.720 and pin dia. of .9842. Still waiting for the new one to get here, to see if it has clip groves. I did look on ebay an found exact match but only as a set of 8 and I just needed one. Mine are 285ncp and they say they are both floating or pressed. Well if it doesn't work I guess ill buy a whole set.. But I was trying to avoid that and would of bored the block instead of a deglaze. Going to take more than a few hundred dollar set back to slow down this love/obsession. Thanks Guys