KB 107 pistons

They're good for our use. My last couple sets were Hastings Moly. Again, I would buy the kit & check the ring gaps in the bore. You'll most likely have to open them a bit anyways due to KB specs. Not a big deal. Check first & if so pick up a ring filer for $50 & make 'em nice. I wouldn't really recommend hand filing as it can be tough to keep the ends square.