Fisher and Western Plows use some of the same hardware. Solenoids, Motors, O-rings, gasket and filters can be used on either plow. There are exclusive items just for the Fisher plow for the pump assembly. The pump uses its own pump reservoir - 291 CIR. If you need just the cap with dipstick this can be ordered separate. The Fisher plow also has its own: solenoid, in-line filters, o-rings, elbows and adapters to work with the o-rings that do not match up to Western plows. Special adapters that go from a 9/16" o-ring to a 1/4" NPT fitting come in straight, 45 degree and 90 degree angles.