Boston 058-BLR stemmechanieken voor gitaarbutton is 23 mm wide, shaft is 6 mm in diameter and 27 mm in lengthdistance between screw holes is 27mm40,55
Boston 059-BLR stemmechanieken voor gitaarbutton is 18,5 mm wide, shaft is 6 mm in diameter and 26 mm in length38,15