bridge for e-guitar, tune-o-matic, stud spacing 74,0mm, stud diam 4,0mm, gold Boston Musical Products is also known for its wide range of guitar parts for both electric and acoustic guitars, but also bass and other string instruments. With over 3,000 guitar parts, Boston is ideal to upgrade or repair your instrument, but also building your own instrument is a possibility. specifications post diameter 4 mm post length 30 mm post spacing 74,0 mm string spacing 52 mm radius 15; wire retainer yes notched saddles gold finish