Didn't see this earlier , but the TT600 protectors fit the older XT's at least(I believe same with the 3TB as well) and were only $14 compared to the $60 for the XT's . They are made out of UHMW instead of the Teflon mix of the XT's so are louder , you can hear the chain slapping and sliding on it thus why the XT's are the softer material . Once chain lube is smeared on and other gunk the noise goes down .
I even wrapped some of mine with strips of Gorilla tape where the chain slides , making sure the ends of the tape are wrapped underneath so they're pinched under the slider and stay tight . Unbelievable how long that stuff has lasted .
Another option that I've done is screwing 1/4 strip of Teflon on the topside so the chain slides on it (I have cheap access to the stuff) instead of the base protector , if it ever wears out I just slap on a new strip.
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