Billet specialties street lites backspacing question

[SLPCobra]

Okay I've asked this before but only for the 17x7
So Ik what it should be with a spacer for the 17x7 and I also know for the 17x11

But what kinda backspacing for a 8 or 9.5 should I be looking for?

Any help is appreciated thanks!

Zach