Advice on external (front oil cooler) thermostat supplier

[Magnum]

Hi all

Further to my related engine cooling post, I'm now looking for a good used Porsche external thermostat (threads intact etc) or alternatively a mocal/setrab version.

However for this latter route i'd want to speak to a knowledgeable UK based supplier who has done this multiple times! Please could I have your suggestions on whom to contact?

Regards