mustangs plus says 4 3/4 back spacing for 69?

[streetgrande69]

i still am really unclear on what my backspacing should be here. i want to put on 17x8 on my 69. any help?

thanks guys.

 

[Route666]

I think that sounds right. I had it figured that 17x9.5 rims would fit with a 5.5 BS, so I'd say 8" with 5" is good, 4.75" is close, so it sounds right.