Weld wheel backspacing

[MT BUICKNUT]

I am ordering Weld Ultra-lights for the front of my 70GS what is the right backspacing and lug spacing.
TIA Rick

[brblx]

what size wheel and what size tire are you planning on using?

your car uses a 4 3/4 bolt pattern.

[MT BUICKNUT]

I am going with 15" , the size of the tire has not been determined. I am going with a stock sized front tire.
Thanks Rick