I scored not one, but two sets of narrow AC/Simplicity wheels. One set with new Diamond studs on them, also found the set of 4 bearings, races, spacers and seals online for 29.00 with free shipping, or 18.99 for just the bearings and races. i already have the races and one set of bearings, do I really need new ones, and what about the spacers and seals?