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I have a 2001 ford f-150 extended cab, and i just bought 20" rims for it, but when i went to get them put on they did not match my lug pattern, how do i know whick rims to buy for my truck that will fit
a 2001 should have 5 bolts to the pattern, they are on a 135 mm circle. older 1/2 ton trucks were on a 5.5 inch pattern, that might be the trouble if you said 1/2 ton ford.
You truck has a 5 x 135 bolt pattern. 5 lug bolts on a 135 mm bolt circle. Good luck! 
