Vampire FB.9 Help Needed – Smiths Fuel Tank Transmitters

Hi all.

Looking for help to locate Smiths float-type tank transmitters, Ident no. 6A/1975, Smiths p/n 917FG, Type 237.

These are for the single-seat Vampires that have the 5 fuel gauges; they predate the change to the Pacitor contents system.

They look a little bit like those in the image below, but are much longer.

Thanks.