That base is the same as the Vortex just without the holes.
Was probably just a mustang or something. The full size power torque cover would rub at the back.
With the few Vortexes ive had thorugh here and the one i kept for myself, some had the victa cast into the front hinging under the covers and others were just flat. I think its the series 1 thats flat.
Good haul that lot. almost makes me cry.
Theres 3 or 4 there you could fix up and sell to fund restos etc.
Did you see the supreme on ebay??