mine has finally fallen off, and is cracked on the inside casing...im in need of a new one...i searched eBay with no resolve...anyone know a site where they carry small parts such as this?

 

trek buddy!...perfect excuse to get an aftermarket unit, because finding a part like that will be super difficult, unless you can go to a junk yard and pull one off one...which will be pretty difficult to find!

 

Have you tried the dealer? Probably won't be much help, but it's always worth it as a last resort. If not, I have another OEM unit and I could send that to you cheap if you run out of options (assuming you don't wanna go aftermarket).

 

try to go for a shop that repairs audio stuff .. u might find something there .. otherwise >> SUPER GLUE ... yeah check what kinda crack & try to repair it ur self to just fit again .. also a small pice of paper wold help to fill the gap & make it hold again.
all the best.