After ringing round several BMW dealers trying to get some replacement lower seals for my r1100gs injectors, without any luck, I found this company.
http://mrinjectoruk.co.uk/
I emailed them a picture of the injectors and the dimensions of the old and somewhat shrunken seal. They knew straight away which seal was required. They also said that the seal was common with a lot of Japanese cars (denso licence various injector designs from other manufacturers).
Worth a call if you are stuck.
Just to add the r1100gs lower seals are a square section O ring, not a normal one.
http://mrinjectoruk.co.uk/
I emailed them a picture of the injectors and the dimensions of the old and somewhat shrunken seal. They knew straight away which seal was required. They also said that the seal was common with a lot of Japanese cars (denso licence various injector designs from other manufacturers).
Worth a call if you are stuck.
Just to add the r1100gs lower seals are a square section O ring, not a normal one.