1980s Marshall 1960A skid trays??

[Jalmeida]

Hello,

I have a 1980s Marshall 1960a 412 cab I am bringing back from the dead and I am looking for the long narrow skid trays that mount on top? I can similar trays for Marshall amps. But it appears the new ones available are flat bottomed. The originals were not flat bottomed and were meant to mount into these routed recesses. I am sure I could fit the flat bottomed trays, but then I would have the recess below that I fear the head feet will cave into.

Any ideas where to get these vintage style skid trays?