csfi poppet valve retainer replacement source

Searched for quite a while and found nothing on this, so figured I'd ask.
I'm replacing my fuel pressure regulator, and pulled the csfi injector module to clean things up. Removed the poppet valves, and broke one of the plastic clips. Went to dealer and found I had to buy the complete injector assembly. Did this, and while working with the csfi module to replace the injector, broke another one. These clips seem to be brittle with age. The new clip is flexible. Not wanting to pay for a complete injector assembly, I wondered if anyone has a source for just the clip?
Looks like Linder Tech Services offers an injector service kit, but don't know if that's available to me. Will give them a call soon, but wondering if others have had any success with getting these retainers.
Thanks,
Don