17x11's on duster

I'm going to look at them after work. They came off a 2000 mousestang.They are aftermarket TQ thrusts so I'm hoping the back space is less than 5". I'll take a tape messure and check on the back spacing. I know I put some wheels with 5" back space and the tire hit the springs. I'didn't even try them in front. If I don't think they will fit I just won't by them The seller want's 500 for all 4 rims and 4 275x40 and 2 315x35 tires. just the tires alone if they are in good shape are more than the asking price. If I think the rims will work with like 245 and 275 tires I may still get them and try and sell the tires I cant use.
I have 225x50x15 front and 255x60x15 rear now.

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