Thanks Steve, it's these green sensors
https://www.dmgrs.co.uk/search?type=product&q=airbag which are new and well priced which according to Mat are interchangeable with the orange ones.
Sadly, Rimmer's site is getting to be more of an irritant than useful, so many parts not recognised, and these YDB000310 sensors aren't, takes you to a parking aid instead
Keep well