Hi Matt
The part number for discs is: 7701466540 (same for Bendix and Girling systems).
If your calipers/pads look like these, then you've got a Bendix system, in which case the part number for pads is 7701202890; if they are different (sorry, no photo), you'll have a Girling system. Girling pads: 7701202893.
If you're passing this way, I've got a spare pair of NOS discs, as well as Bendix pads.