Point-Seven-five
Life time member
Number of posts : 4216
You have to take the old bushing out to put the new one in. Take it out, measure it, and order a new one.
You know the ID is the bolt that goes through it, and it shouldn't be that hard to make a very good estimate of the length. Measuring the OD of the frame tube the bushing is inserted in and subtracting the wall thickness should give a pretty good idea of the required OD. I'm going to guess that the wall thickness is the same as the tubes you hacked off the rear of the bike.
I doubt that even BMW would go so far as to use a custom bushing for that application.
As a service to your fellow K bike owners, when you are done you could post a photo of your old bushing and it's dimensions.
__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175