The Fisher Body Tag
My understanding of the relationship between Fisher and GM is basically the Fisher company was under contract with GM to produce car bodies for the assembly line.  To make sure the car had the equipment it was supposed to by the end of the line, and to document what was in the car, a tag was placed on the vehicle with coded text representing the options on the car.  Now not all options were included, just those that affected the way the body was built etc.

The Late Model Corvair has this tag in where the engine is located (in the back of the car).  Right under the right turn signal lights on the rail of the body.  It took a bit for me to find mine because I wasn't sure what I was looking for and it was coated with gunk that made it hard to see.

I took a quick snapshot to have this available for later reference.  No I am not going to remove it, but its easier to reference if you don't have to go out into the garage to get at it.

I am no expert on all the decoding of these fields, but what I do "think" I know is shown below. 

02B - 2nd Week of February 1966.

D -????

ST - ????

TR  - ????

66-10567 WRN - 1966 Convertable Willow Run Facility

5701- ????

740- Red Interior

WD2M - Tinted Windows, Power Top, PowerGlide Automatic

R-1 - Regal Red Paint - White Convert. Top.