Filtertron® Humbucker size mounting ring These will not fit Gretsch® Filtertron® pickups!  These will fit Lollar’s Lollartron Humbucker (humbucker-sized Filtertron) pickup Made in USA Nickel plated brass These are not made of plastic Dimensions are 3 5/8" (92mm) x 1 13/16" (46.2mm) x .08" (2mm) thick Inside dimensions are 2 25/32" (71.4mm) x 1 17/32" (39.7mm) Outer mounting hole spacing measured center to center is 3 1/4" (82.2mm), Short side 1 15/32" (37mm) Pickup mounting holes are 3 1/16 (77.7mm) ***Please check dimensions before ordering*** MOUNTING SCREWS ARE NOT INCLUDED - uses #3 x 3/8" oval head screws (Gibson pickguard/backplate screws) Qty 1 pickup mounting ring