Originally Posted by W8EJO
Does anyone know which year's/models seats are interchangeable with my 1974 R90?
Some of the /5 seats fit. What's called the LWB /5, that stands for Long Wheel Base. Not all /5 seats fit. They also have SWB, that stands for Short Wheel Base. The LWB /5 fits.
All the /6 seats fit except S bike, the R90S.
The /7 seat will fit if also done with the tank. The /7 tank is longer so if done with out the tank there will be a large gap between seat and tank. I guess you could say the /7 does fit but looks funny.