I am in process of replacing the timing belts on my 2000 GL1500, and found the belts I purchased about five years ago. They are Gates brand, still in the box, and have been stored in a tool cabinet. My question is----- since they obviously have no wear, no kinks, etc. are they still OK to install? I'd really hate to toss them and repurchase, however I don't want to put my engine at risk! Any thoughts, advice, observations, etc. on this??