OK..I really like this unit! But! There was instructions to install, in correct way, the bolts, the nuts & specifically the WASHERS! There were 6 Flat Washers & 6 sliced uneven Washers! On one side I was able to insert the bolt alone with flat washers with the slpit-uneven washer & nut on the other end. HOWEVER!, when tried to duplicate the same the thing on sleeve it didn't work! Which is to say, I tried to insert the bolt with the flat washers but the hole was too small for the flat washer to go into hole so the head of bolt would be flush to flat surface of the collar of the sleeve just it did on the other side. So I had to insert only bolt on one side first & put the flat washer, the uneven-sliced washer & the but together on the other side. So don't know how well it will perform until I receive my bumper weights next month.