4-STRING TUNE-O-MATIC BASS BRIDGE (no posts)
String spread is 57.25 mm (2.25" or 2 1/4") outer saddle center to outer saddle center
Post center to post center is 84.8 mm (3 11/32" or 3.34")
String spacing 19 mm (3/4" or .75") 
Bridge width is 15.9 mm (5/8" or .625") 
Bridge length is 98.95 mm (3 57/64" or 3.895") 
Bridge height is approximately 12 mm (1/2")