Well, if they kept the original size of the tires when the replaced them then they should be something along the lines of p205/75R15's. I good look with 17's would be for a 17x10 in the rear a P275/60/R17 which gives a prostreet look or just a regular good height is a P295/45/R17...not sure if they make either in BFG's anymore. for a 17x8 up front if thats what you go with then a 245/60/17? to compensate for the pro street look in the back or a 255/45/r17 to look good with the other rear size I offered