If you notice, you will see that there is a stamped area to accommodate a 4th support to the passenger side, but no support installed.
Seeing that, it occurred to me that perhaps with a RH drive vehicle, the wiper linkage would be reversed and the unused support along with an added support in the 4th position would be used, along with a specific louvered panel.
I can't explain why Fisher would have provided the one unused support for all builds, that seems like a waste for the few RH drive builds especially if the 4th support was not also always provided.
But that is my best guess.
I figured the louvered panel was different for each Div. A body, but from what I see in early Chevy & Olds Parts Catalogs, the '64 Chevelle was different, but the '64 F85 used the same 4489189 (Gr. 10.307) as the '64 Tempest and the '64 Chevelle and the '64 F85 used the same wiper trans p/ns you listed. Couldn't find anything pertaining to the Skylark but pix of it show the wipers in the same position from what I see.
So I don't see any Left Hand Drive application that required that unused support.
Do you know if that extra support is also found on the '65 Tempest? Just wondering if they realized it was unneeded and ever deleted it.
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