If you still have the old unit have you tried some of the companies who repair old units, not sure where you are but there is one called Shandon in Bellshill who have hundreds of units on the shelves. You may find that your unit is a standard automobile type. I am sure that some of the old Volvo engines had Peugeot starter motors (sold by Volvo at three times the price I am sure)
thanks for the advice. would you have a phone number for shandon.i am up nr aberdeen .so i would be able to go down there and see what they have got.cheers ally