OK here we go! You need 4.5 - 4.75 inch backspace on your wheels to clear the brake calipers.That means 8.5" wide rims on the front and 9"-9.5" rims on the rear. A 265/50-15 on the front and 295/50-15 on the rear. If you have a rear sway bar, it might have to be removed, Vette Brake and products also offer a shorter mono leaf rear spring that won't hit the tire.People that go with 16" or 17" will have to move the parking brake cable to the back side of the trailing arm.See my pics of my 77' spring and shocks and how close they are!
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