1969 dart wheel and tire size?

I never did recheck my backspacing after getting the centres moved out to make more backspacing,but Im gonna say they are roughly 4.75"-5" BS.
The 245/60/15 fit perfect!!!
Id even say I could sneak a 255/60/15 in there....
keep in mind,my car sits low.
Im gonna find a 255 and mount it and see how it fits,gonna be tight but I think its doable..
anyhow hope this info helps somebody down the road..