Hello All, While I was installing a B-5 Bigsby on my G5435LH BK Pro-Jet, I removed the pickups in order to see how they were built and mounted, and I took some pictures. Here they are : As you can see, the FilterTron Black Tops seems to have nothing different externally from the standard FilterTron, with the exception of the cover. So a swap is probably possible... But let me say that I find the Black Top very good sounding, probably having "that great Gretsch Sound" kind of tone, so eventually I wonder if a swap is worth (?). A+!