Sturdy thick mounting base. Dense foam. Threaded inserts for positive mount and high quality covers. Width 5-1/2" in front to 7-1/4" in back. Three mounting hole system. Front hole is centered left to right. Front to rear holes are 10" on center. Rear holes are 3.5" apart on center. Direct bolt on for the Baja DB30S!!! DB30S-189
The threaded inserts are 1/4-20 and the M6-1.0 DB30 screws cannot be used on this seat!