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Message: <blockquote data-quote="ReplicaR" data-source="post: 922666" data-attributes="member: 9209"><p>Rule of thumb is that a 1.25 inch bolt on spacer usually makes 8 inch wheel flush in the back of the mustang. If you want to get all educated about it, get a string and a lead weight or something heavy, and attach it to fender lip. Measure from where the string is to the rotor hub. That's your distance of half wheel plus offset. Figure it's an 8 inch wheel, so 4 of it is on one side. Subtract 4 inches from the distance you've measured, and you have the distance that you have to make up with offset and spacer. Subtract offset from that distance and you will have the rough size of the spacer needed. Pick the spacer roughly the size you are looking for, and don't forget that the tire will probably be slightly wider than the actual wheel, so that's something you might want to keep in mind.</p></blockquote><p></p>