I'm taking off my 52" deck on my husky and ordering a 61" deck. I have the parts manuals for both decks and am only ordering the new parts that are different (the deck just comes by itself). the housings are the same. How many hours do the idler pulleys last? I'm thinking of buying new ones but there about 120 for all 3, also can they be lubed at all? any suggestions would be appreciated. I want to make sure I order all the right parts I need to do the swap in one day and be back to mowing.