So presumably all cars in a certain batch / age range will need their rears changed (i.e. the ones that are listed on the recalls database) and the 7.5J is just to ensure the dealers only change the rears and don't get confused with the re-call and change the fronts too
Yep, 'spose so

Can't we just get Vauxhall to tell us the VIN range? Then we'll all know about the wheels at least.