interesting...spent alot of time looking into this... the key switch ( with the wires ) looks the same as an plastic XR2 one ( with the little scews ) , also a Capri one , ( which is metal) .

The transit one i have fitted at the moment is metal and arcs when it the casing touches the brake pedal ( ive got it swinging in the breezeat the moment )

Cant find a plastic one anywhere.

Ill look at the sierra ones now.. and also what ignition barrel ive got .. think its been messed about with in that case.

Very nerdy post.