Pistons needed KB 107??

Why not buy new ones? There not very expensive and it's not really a good idea to use used pistons. And keep in mind the KB107's weight a lot less than stock 360 pistons so the rotating assembly will need balanced if you use them.
I second that comment, but I will mention there is a member on here that posts in lots of peoples threads trying to sell a set, but I forget his username, all his posts are one big run-on sentance. Maybe someone can point you his way. Anyway, new in the box, shipped to your door from summit or jeggs would be the best way..