On my 65 B, I made up an entirely new core support for it. Had some 1x2 formed up for the upper tie bar, used some 1" or so square for the verticals off the rails, some 2" square for the lower support and some formed 16a for the side baffles. All of this was fitted for my Be Cool unit with holes punched for bulkhead fitting pass throughs for a/c lines, oil coolers.