Wanted - Nut for heavy duty drive flange

Does anyone have one of these lying around? My vehicles been fitted with HD drive flanges on the rear and one sides missing the metal nut. Being cheeky but don't want to have to buy a full set in order to get a single nut. I've a feeling its the Britpart type thats on. Defender 1996 "TA" chassis if that helps.

Thanks

James.