Progressive 13-1240B Magnum O/R Shok 15inWith shock and fork spring fitments all the way back to 1949, Progressive Suspension likely has the suspension setup you need for your restoration, AHRMA racer or vintage machine. The 12, 13 & 14 Series dampers are sold as damper sets and can be mated to a number of springs to properly tune for your application. This Part Fits: Year Make Model Submodel 1978 1979 Bultaco Frontera 250 Base 1978 1979 Bultaco Frontera 370 Base 1977 1979 Bultaco Pursang