RC11,

I believe this is where I ordered mine from when I used to run 2C. This stuff is very strong and fits very tight. (Make sure you zip tie and clamp down good because it will not bust.)
5/8" x 3"
http://www.rocketcityracing.com/prod...0&item_id=1433

1/2" x 3"
http://www.rocketcityracing.com/prod...0&item_id=1432

hope this helps.