At one time I believe Len and Andy Backus that own this website were selling the bracket and quiver combination that custom fit the TAC crossbows. Please contact either one of them and ask your question.
If like Me, you live in Europe, where most of the Goodies are either: Illegal, Unavailable, Expensive or Very Expensive, some of the normal Archery Bow Quivers will fit on the lower half of a Scope Mount. So if you have 1 lying around & some nice Stainless Screws !!!!