Is that a Tec series bow?
I looked around and couldn't find any myself. I would just contact Hoyt with the make/model of your bow and let them know they are dry rotted. I bet they will replace them and if they don't, I'm sure they would be happy to sell you some...
You may read the manual for it to see if it says anything about getting replacement parts...
http://www.hoyt.com/customer_service/hoyt_bow_manuals.php
Well the guy from Hoyt said they are no longer available through them. I'm gonna keep rooting around and see what I can come up with before buying the Bowjax ones though.