Decided to try making my own up.
Bought older style metal cap and cut hole in top
Split new Jag sovy unit and fitted plastic top through hole from below with rubber gasket to give good seal
Shorten shaft after careful measuring
Shorten case to suit
Crimp case back onto plastic case
New cap rubber washer in
Job done. Screw cap on and line up terminals to suit wire location
Pretty happy with the travel for fluid sensor and done think the case and cork displace too much fluid for it to be an issue
Next job is to flush through brake fluid and then bleed.