The good news here is that other than perhaps the thickness of the pads, almost everything looks both simple and without critical tolerances... i.e.: it shouldn't be a huge problem to fabricate replacement parts.
That cross piece is really just a rectangular strip with a large hole punched/cut in the center, the corners knocked off, a few slots, and two bends in a press brake. The horizontal dimensions of the replacement pads likely aren't critical, nor are the shape or way in which the corners are removed, nor the slots, or the diameter or absolute centering of that center hole provided it is reasonably close.
Of all of the NLA parts to have to fabricate, I think you lucked out!
That cross piece is really just a rectangular strip with a large hole punched/cut in the center, the corners knocked off, a few slots, and two bends in a press brake. The horizontal dimensions of the replacement pads likely aren't critical, nor are the shape or way in which the corners are removed, nor the slots, or the diameter or absolute centering of that center hole provided it is reasonably close.
Of all of the NLA parts to have to fabricate, I think you lucked out!