I would have to dig them out of the box (the engine is apart and boxed) to check but as I remember the pin to top measurement was the same as oem 750 pistons. The skirts were modified as those T Kawies were a piston port engine and didn't have the cutaway for the reed. These were mid 70's free air 440 pistons. I think they are stiil available through Wiesco and maybe others.
Here are some pics when we tore it down. This was a complete Bender 880 trail setup with pipes, 90 fire CDI, bored carbs, matched and cut heads, direct oil injection and clutching. Was supposed to run at arond 92-9300 and make about 170ish on the HP.
We might be selling all of it and building it back to stock.
opsled
PS, I was thinking these were single ring (been a while since I've looked at them) but as you can see they are dual. Preaty sure top is an L style.