Hi All - Who can help with this? I removed a set of SM3 Mini Humbuckers from my Les Paul Special and fitted P90s. The SM3s were pro-fitted by a repair shop some years ago and fit straight into the P90 slot. The P90s and the Mini HBs screwed straight into a plate which was at the bottom of the pickup rout. I sold the SM3s on ebay and the buyer has asked how they fit - he is making a custom guitar around these pickups. Who can help with this query? I wonder if the metal plate came with the SDs or if that was a standard Gibson fitting - anyone know?