I think you may be referencing the little Trico bushing that fits between the wiper motor and the wiper arm. Look in the link below, there are 3 of the bushings. At least this may give you an idea of what to look for.

http://www.ebay.com/itm/AL-225-Tric...ries&hash=item3f2b8aabf1&vxp=mtr



1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures