Circle Track 9" Rears

[JMarsa]

I'm debating whether to purchase a 9" instead of a 10/12 bolt to camber for my PT/autoX/track day Nova project. So far it seems the 9" will be cheaper.



The circle track vendors seem to have the best prices and lots of experience on the cambering part.

What's the technical/mechanical difference with these types of circle track class rears?

Super Speed Way
BGN (Busch Grand National?)
GN (Grand National?)
Wide Five
Short Track

It seems that the axle snouts are the main difference. Once you choose a style match the axle type and hubs. I'll end up calling some vendors soon, but I'd like to research a little first so I don't sound like an idiot on the phone. Any input or direction for resources is most appreciated. Vendor experience feedback is welcome as well.

--JMarsa