Ever since RaidenTech (and XHeli) have been taken over by nitroplanes, they seem to have pretty good service and really good shipping performance (usually ship same day you order). They are west coast and if you call, they are most available after 5PM pacific. I've ordered a couple helis and various parts at different times and have never, in the last two months, received anything incorrectly. Raidentech coupon CJFREESHIPPING will get you free UPS ground over $50, too.
For you, El Esmeril207PR, they don't carry the Belt CP Carbon.