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This input shaft is designed for use in Hewland and Webster Mk-series gearboxes. The 7/8-20 spline size is common for FF1600, Cosworth BD-engined FA/F3 and sports racers, and FSV. The extended 12 11/16" length fits Lotus 51 and 61 Formula Fords, Lotus 23 sports racers, and some other Formula Fords with 3 1/4" thick gearbox adapter plates.
We also carry the Standard Formula Ford Input Shaft for cars using the more common 2 1/8" thick gearbox adapter.