Inhibitor harness for series 1 2+2 auto

[Harveysearle]

Hi guys
Trying to get hold of a inhibitor harness for my car.
No one has one. Autosparks say 4 months wait.
Has anyone any ideas. Might have to try and make one.
If anyone has made one and has any pics or has one I could buy that would be great
Cheers Harvey