These are made by Aero pickups mainly for a direct replacement on Travis Bean basses.
I purchased these for a possible custom build but never happened. You probably need to look at the actual Travis Bean basses(pic included for reference) for install clues. They are attached from the back side by two screws that go through the body and screw into the outside holes on the back of the pickups. Very different design I know. Was going to try to make a Travis bean copy. I added that schematic but the quality is bad. Got that from the Travis Bean website.
includes shipping in US
I purchased these for a possible custom build but never happened. You probably need to look at the actual Travis Bean basses(pic included for reference) for install clues. They are attached from the back side by two screws that go through the body and screw into the outside holes on the back of the pickups. Very different design I know. Was going to try to make a Travis bean copy. I added that schematic but the quality is bad. Got that from the Travis Bean website.
includes shipping in US
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