Two motors were used on Buick intermediate-size cars for '69:
4918442 for non-depressed park wipers, standard on 43000 series models
4939586 for depressed-park wipers, standard on 44000 series models (optional on 43000 models)
Sportwagons all had the depressed-park system. Skylarks, depending on trim level, could have either type system.
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