so i DOUBT PICS WOULD HELP but we put a mustang rad in a fiberglass t. we just mounted two upright angle irons the fit the factory flange s and bolted it in pretty straight forward other than we mad the mount gussets and removable . Ill get a pic tomorrow if I remember.
Hope this may help. I welded 16 gag metal to the rad support and welded bolts to The 16gag Metal for the mustang rad to set in the 16gag metal also works as my fan shrald.