Was RPO PL5 a mandatory option for the COPO cars?
 

I've noticed that it shows up on all the window stickers I've seen for COPO cars. But I also noticed that the 4.10 HD rear showed up as an extra cost option on 1 COPO but appears to be standard on another. Was there a change in what was included with the COPO 9561 part way through the year. The later of the 2 cars had the 4.10 rear as a seperate option.

Re: Was RPO PL5 a mandatory option for the COPO cars?
 

I have GM of Canada info on one COPO Chevelle that came with PW7 white wall tires, the same as our L78 car. Most came with the PL5 white lettered tires (Uniroyal, Firestone etc.). The dealer charged us $2.75 extra for the G84 4:10 gears and listed them as option H05. The rearend housing is stamped KQ. They charged me $31.10 for a HD V01 rad which the car didn't have, just the regular 3 core unit. They didn't charge us for the U15 speed warning indicator which the car did have. I don't rely on their billing methods as an accurate method of determining what was part of the COPO package for obvious reasons.

Re: Was RPO PL5 a mandatory option for the COPO cars?
 

Some COPO's also have PL4 tires.