Last year I found the best price for my 295-55-15's at americanmuscle.com they have free shipping. Love the irony of buying stuff for my Buick from a Mustang site.
Frame isn't notched, fit is OK on the inside. They would rub the fenders if I had a passenger and no air in the bags. I just rolled the lips but haven't had it out to see if it works. 8-in rims 4.5 BS