Honestly, Wipermotors/Parts are a bit of a Crapshoot as to weither, or not you are going to get the right part for your application through an Aftermarket Parts House/Etc... In your case, it can be even more of one since you don't know the year off hand.... A simple part number off the current motor can help at times, but generally best bet would be to take your old one in to compare.... Variable Speed motors were optional on earlier years, and Single Speed Motors were Standard(I want to say '73-'79/80)..
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