Well the 26700AE030 Disk is a 290mm x 18mm Vented rear Disk with a 170mm Hand Brake Drum. My source says that the PN has been superseeded by 031 but ....??
subysouth - I'm still interested in info on the Backing Plates that you posted a picture of in the Suspension forum - looked like they had two sets of mounting holes - info plrease ???