I beleive older Suzuki GS500E's and Kawasaki EX500's (I know for sure the EX500...because I was on a ride with someone who had an older one, and her brake pads fell out, and I could see its exactly the same as ours!).
Yep,pre-96 GS500E has the same rear rotor and pads,I know because I bought a Galfer wave rotor and pads for one and it fit the B4 perfectly.
Dennis Kirk catalogs make great cross-refference books since they list all kinds of parts for almost every bike made.Just match up the part number and youll be able to tell what bikes take the same item.I use it for seals,brakes,sprokets,filters......just about anything thats model specific.Brake pads are especially easy since bike makers source their brake parts from other companies.
For the fronts.......
90-93 VX800......Suzuki V-twin,cool standard.
91-93 GSX1100G.....Big Suzuki sport tour,great bike
88-01 EX250F.....Ninja 250 twin.....chick bike
87-02 EX500.......Ninja 500 twin.....fat chick bike
90-93 ZR550-750.......The ol Kawi Zephyr,also a great bike
88-97 ZX600C.....Crusty old Ninja 600...not the ZX-6
Looks like mostly just Suzi's and Kawi's....thats all I could match up under Vesrah pads in the Dennis Kirk.......sorry about the comentary!