Guitarfetish.com - Here's the setup- Our “Coming Soon” GF'Tron pickups and a GFS Protube in the middle. The GF-Trons are exact replacements for the classic Filter'Tron pickups used in vintage Gretsch guitars,
GFS Dream 90 and Dream 180 Pickups – electricpickupartist
GFS Soundhole Magnetic Pickup Ceramic magnet for Extra Clari