Hey guys iam putting oil seal the one that keeps the oli from reaching brakes ? the bearing retainer wher the oil seal goes i no there are some shims behind the retainer but is there any type seal or gasket etc that i need to replace Also the shaft that goes through the brake drum it has a little groove on it where the oil seal rides the groove is not very deep just wondering should i drive the seal in a little futher? Thanks for all the help