Hidden Wipers
9901B - Decal decodes as 99th day of 1970 , 1st shift, "B" assembly line
My build date is 05E which decodes as May 5th week.
No wipers seen
Extra Arm on the drivers side for hidden wipers
Trico Made in USA 18" Wipers With 5 Claws
Hidden wipers option got you 18" blades