I am having a problem installing a 65 Mustang 2 speed wiper motor to my 63 Ranchero. The switch, wiring and motor installs fine into the old 1 speed motor mount bracket. Here's the problem. The crank arm from the 1 speed motor fits ok into the Mustang motor, but the linkage won't line up. What the result is the wiper blades Do NOT park down on the bottom of the winshield as they should. This is because the linkage is now "too long" (was fine with the single speed set-up) & if you "force" it to fit the crank arm, the wiper arms do not rest right--they are pushed up the windshield. The arms sit about 2-3 " above where they should be. Would cutting the linkage to fit solve the problem or would the travel then be a shorter wipe because of the cut--the wipers would then not go all the way to vertical & back correctly. The motor "parks" at rest a bit farther to where the problem of mounting the linkage starts.