I remember reading somewhere here or on facebook, that people are keeping their annexes attached to their RTT via adding another channel so as to not have to remove the outer cover. CVT sells one for $30 but shipping is $40, so I assume this has to be just a channeled piece of aluminum and I can purchase on amazon or somehwere. I have searched amazon with no luck but not sure of what the actual item would be called I've tried all the non technical terms like rtt cover channel etc. Thanks if anyone can help out.