Series 3 Series / Defender ignition barrel compatibility

Afternoon all,

I'm looking to swap my original 2.25 diesel ignition barrel (w/ pull to stop) for a Defender barrel giving the right terminals for a 200 tdi conversion.

Can anyone confirm which part numbers actually fit the Series steering column? The research I've some has suggested there are different sizes, but I couldn't work out if it was the actual switch or the clamp diameter that varied.

Alternative is to have a push to stop switch on the dash for fuel cut off, or some diodes in the wiring but I'd rather do away with the redundant pull to stop and give it a new home.

Thanks

Convert the "pull to stop" to a series 3 choke cable, use that to activate the glow plug relay.