I hit Google and tried to find the last two remaining RPO codes. I found both the WS1 and the NOD codes after about five minutes worth of searching.
The WS1 code
represents a dealer ordered package that included
CC1 ~ Removable Glass Roof Panels (T-Tops),
N33 ~ Tilt Wheel Adjustable Steering Column and
K34 ~ Electronic Speed Control w/resume.
By ordering these three items together (possibly a prelude to the later 1SC
groups), the dealer could get these three items at a lower cost than if they
were ordered independently. The NOD RPO code is the designation for the
Norwood, Ohio assembly plant where the car was built in 1986.
in the Van Nuys, California plant received "VAN" to their RPO codes.