Fiberglass fender flares

I am rebuilding a 73 Z for show and mostly fun. I bought the aero kit from motorsport auto, glass nose from JC Witney, and fender flares from Victoria British. The fr. flares are great, they come out from the fender in a concave shape. The rear set I am not satisfied with they are a bubble shape or convex. The car hasen't gone to the body shop yet, none of these parts are on. I was wondering if anyone knew of a company that sold the concave style flare for the rear. I had a set like that installed on a 72 Z I had in te 80's so they at least did exist at one time. Motorsport and Victioria B have allways been a great help but didn't have this.

Can anyone help?