Hi John,
Most of the older H/pt d/ws were licence built from (or sometimes built by) Bosch. If you can find an FD no. on the label at the top of the inner casing of the machine, Bosch may be able to help you. Don’t get you’re hopes too high though.
Good luck,
Penguin45.
(We recently got a top pump housing for a 35 year old Bosch dishwasher; the girl at Bosch was upset because she had to get it from Germany. It took 4 days to come).