proper way to measure for rear end u-bolt length?

RustyRatRod said

Are you asking how to figure length? I measure from the top of the tube to the bottom of the perch and add 2".

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yes. the ones on it are perfect now, i'm adding a tie down plate to the bottom and need something about an inch longer. i though it was the inside of the arch. not sure what the hell they were measuring to get 9" out of the new ones but they measure 10"..

any good recommendations on where to order a set of properly measure u-bolts?