Genuine Hewland 12/31 fixed first gearset, part #F3A-12:31-INT. Original standard 8-dog, converted to 4-dog quick shift (see photo). Fits NST & Dallara F3 (1994) gearboxes. General condition: Lightly used 31T gear dog condition: Excellent / 90%+ life remaining Fixed gears + shaft condition: Excellent .
