[isellfn]

I have a friend with a 1968 Mustang, he's wanting 18 x 9-1/2" wheels in the rear.

What backspacing should be used?

Thanks

 

[2nd 66]

probably similar to the 17x9.5 .only guessing though

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[dbenichou289]

I have 5.5 on mine, 6 would be ideal.

 

[Isellfntoo]

I have 5.5 on mine, 6 would be ideal.

Will that fit in the stock wheelhouse?

 

[dbenichou289]

Yes. With the 5.5, I get a little tire rub inside the wheel well on big bumps - passenger side only due to the design of the cars, but not on the fender lip. My car is also lowered a bit. The 6 should fit without any issues. Hope this helps.

 

[eldog]

I have 6.75" backspace on 18 x9.5 on my 67. It has a rear disc brake kit which required and 1/2" of backspace so if your running drums in back 6" would probably be just right.