I have a 1985 K100RT, manufactured in 11/19/84.  It has  only 30,000 miles but still over 30 years old.  I'm in the process of replacing the fuel filter and internal fuel hoses.  I touched the fuel pump gasket and wow it is pretty gooey, and I see the black rubber bits in the bottom of the tank,  so I best replace it.  I looked at the BMW parts fiche and believe the correct replacement  part is called "fuel pump vibration damper" rather than gasket, pn  16121450712.  Expensive little bugger, about $90.    Is this the correct part?  My local BMW dealer isn't familiar with the old K bikes and I don't want to order the wrong part.  I was surprised the hoses were really cracked so they are also being replaced.  Thanks,

Have a look at EME they are a good place to get much of this stuff and heaps cheaper. Probably best to get a fuel pump on fleabay as the price will be better
https://www.euromotoelectrics.com/

Thanks,  I ordered vibration damper from them.  Good prices on lots of stuff.  jim