The 55-57 chevy specific bench seat shifter has a HUGE bullnose shape to get around the front of the seat. My ol' man has a 55 bench seat car (327 4spd). When he put the car together in '68, he used the generic 'fits all' Hurst Comp/Plus shifter with a straight stick and a short 90* bend at the top. His bench is shoved all the way back and the stick is pretty close to the front of the seat.
The original tri-five chevy specific shifter had the 'stick' WELDED on not bolted (at least the one I have is). The stick starts out parallel to the floor and sweeps out and up to clear the bottom of the seat, then it curves back to clear the top of the seat. Its BIG; I think something like 15" tall and 7" wide for a 'footprint'. Theres a Hurst bolt-on universal bench seat stick (I think the PN ends in 8620) that has a dogleg above the 2 mounting bolts