Mine self-park. They're just not synchronized.
IMHO, having had them for years now...ehh. I'd get the cheaper same thing from the tractor/boat/ebay sources. WH are expensive. They work as well as anything else on the old truck does. What I mean is, for 1967 wipers they're fine. Not the equivalent of even my 1995 Grand Cherokee's wipers.
The motors do not sweep as many degrees as the specs/instructions say they should. I get about 90* when the gearbox is set to 110* (see pic).
The arms seem much less spring-loaded than modern wipers.
They DO still work after a number of years, as opposed to the junk China pod wipers.