R100RT Front suspension question

[ChuckyShamrok]

Hi, My father asked me to replace his fork seals on his 81' R100 RT. After dropping the sliders off the forks, a black rubber like ring came out of the left slider. There wasn't one at all in the right slider. What are these called? I assume its a bump stop for the spring that resides in the slider. I obviously need to buy two new ones, as one is AWOL and the other is cracked all the way through. I can't really find it on the microfiche.

[ME 109]

What are these called?

Mystery black o rings.

I don't recall seeing o rings in my 81.

[SteveD]

Mine neither.

[ChuckyShamrok]

Not really an O-Ring, like a bushing. Slid up the fork perfectly, maybe a 1/4" thick. I have a lousy picture of it

[ME 109]

Perhaps a home engineering project. Not familiar with that piece at all.
Not that that means anything of course.

[chasbmw]

Does the bike have ATE or Brembo brakes?

[PAS]

That piece doesnt belong in the forks. Can you post a picture of all the components in one leg in the order they were installed?
I also have an 81 R100RT

[equipo5]

Its reminiscent of a lower fork bumper. Flat on top and rounded on the bottom. Maybe homemade.

[ChuckyShamrok]

It has Brembo's. I'm pretty sure it's home made. But all the components, as they came out were: Metal Spacer ->Spring->Mystery Black bushing

[PAS]

Looks like an anti dive set up. Did it look like this? I think the bumpers are BMW 31422000384