We bought a home and one of the BP3230T panels is broken and we can't find a source for a replacement. I'd like a recommendation for a replacement panel, the 50mm thickness seems to be a bit of an issue.
50mm may be a bit of an oddball. My 320watt panels are 40mm.
The Mission Solar MSE320SR8T panels that I bought last year at about this time are very close to the dimensions of your panel. But dimensions only help for fitting into the vacated spot. You need a panel with the same power specs more than you need a panel with the same size specs.