i recently bought a Hasselblad 201F that came with 4 A12 Film Backs. Two of the backs were good and two needed the light trap seals replaced. I bought a repair kit and replaced the seals but noticed that the small seals that attach to the front plate also need to be replaced. These seals did not come in the repair kit. Does anyone know where I can get these seals or what to use if I can't get ready made seals?