Hey Jorge,
welcome aboard and
.....ohhh wait we use this one on here.
Anyway just wanted to warn you about scupper carts. To the best of my knowledge Hobie is the only yak designed to use a scupper type cart. Alot of the other yaks have cracking issues in the scupper area from using scupper carts. I don't know the exact details but I'm sure someone else will pop in and give you some advise, otherwise any of the OEX stores could steer you in the right direction.
What yak did you end up getting anyway?