Hmmm $67 thieving bastards! I had a run in with a guy I was buying an Alternator from and he wanted $85 to send it from NC but $14 to Seattle so he sent it to my mate there and he sent it on for $46. I have a good source of BMW parts from a guy in Kentucky and he is very good on postage.
Saying that made me think, a rare occurrence, the old R80 and R100 BMWs had those type of retainers on the coils.
The BM Shop in Brisbane may be able to help but he does like charging or Ray Peake at Canungra does a heap of work on those BMs. If you want I can get his number.