This is the standard speed sensor and mounting bolt on the gearbox.
I didn’t like the rusty bolt so I’ve upgraded it to a titanium one
It’s a M7 bolt with a 1.00 thread pitch with a length of 16mm. It’s also a cap head rather than a normal bolt head like some of the earlier cars. It’s a rare size so finding one tooks some tracking down, but in the end I sourced one though Singapore.
Fitted… some other trick bits are in the post to fix up my latest purchase to my exacting standards