This thumb rest is made out of high quality dead clear polycarbonate or solid black acrylic, and precision CNC made in a machine shop here in the USA. The position and design mean NO NEW HOLES in your bass! Includes two pick guard screws which are slightly longer than the stock Music Man screws, so you do not even change the screw holes by adding this on.
This model should fit most Ernie Ball Music Man 4 string basses and Sterling by Music Man SUB Ray4 basses. Please see the picture above with the guard outline measurements to verify your pickguard screw pattern and spacing will allow the Zero-Mod SR1 to fit.
Your guard must have the two holes in the same locations as the guard in the picture, with a screw center to center distance of 70mm apart. It WILL NOT FIT any other pattern.
This model DOES fit the Ernie Ball Music Man Classic Stingray 5 string with the oval style guard - Please check the sizing picture to confirm your fit.
This model DOES NOT fit the American EBMM "SUB" or "Sterling" -- models for those basses will be coming out soon.