1988 744T 160K

I am replacing the injector seals on a 744T project. I removed the caps, seals and spacers some time ago and just secured the replacement parts. The "spacer ring" (for lack of a better term) that goes on first is different than the ones I remember taking off. I didn't pay much attention while I was removing the old seals and I discarded them. However I found some old ones I had saved one time and I believe they are like the ones I took off of these.

The new ones are gray while the old ones are yellow. The new ones have an ID of 10mm and the old ones are 8mm. Also the new gray ones are almost twice as thick as the old yellow ones.

The new seal kits are Bosch 1 287 010 704 (and the sticker on the envelope also adds -850 to that number). The workshop instructions sheet with each kit states:

1 The old protective sleeve must not be removed from the injection valves with yellow supporting plate.
2 Only use flat seal ring and 0-ring (1 item) when a pressure regulator intented (sic) for use with 0-rings is replaced.

My question is HUH ??? What are they trying to say? Was I supposed to keep the old yellow spacer (is that what they are calling the "supporting plate")?

What are the larger gray spacers for? They look like the ones on a pressure regulator and the #2 workshop instruction seems to be addressing that. Did I get some kind of universal 0-ring injector seal pressure regulator installing kit?? Anybody run into this before??

Randy