My protecto plate shows a 4 in location N (as shown on the webpage below). But according to the website below, only a 1 or a 5 should be there. So what does the 4 mean?

http://www.camaro1stgeneration.com/cam1stgen/codes/67protecto_plate.html


--Steve
'67 RS/SS Convertible

If it's a '67, B93-door edge guards.