Randy, standard collets vary with the spinner you are using, and the fit you want. Kinda like there is no standard. Brodak spinners have a funky knurled boss on the back that can cause run out. I machine it off and that changes the spinner fit to the nose ring. Best thing to do is order a spinner (two would be better) and have it shipped directly to me and we'll go from there. The Tru-Turn spinners are different again. I actually use a Tru-Turn type of collet and adapt my spinners to that. Tru-Turn is also pretty expensive. It's not really complicated but I know you want a good fit at the nose ring. I've done them for Chris and Allan, Howard rolls, er, prints his own.
Paul's is different yet. None of the above has anything to do with the actual slots. I assume you are talking about LH rotation.
Or, you could order the spinner, and bring here for a custom fit then we can go fly it! Get two and we can do a two and three blade. The set up is the same on my machine, just nice to make one set up and be done with it. We'll deal with the phenomenal fee later.