The Wheels/tires ('80-81 A7/a8) is made up of components including this Rim,rr,1.85bx18w which is the most expensive.
A sample from the products for the Wheels/tires ('80-81 A7/a8) include: Spoke-inner,fr,239.5m, Spoke-inner,rr,lh,167, Stopper-rim,1.85b(yok, Band,rim,3.00-21.
In this schematic the "Spoke-inner,fr,239.5m" is used most often.