Fender Tag Question

[Old Blue]

My 72 Road Runner has a fender tag with P2R does anyone know what this means? I have not been able to locate any information regarding this. Thanks for the help

 

[69hemibeep]

P= 400HP engine
2= 1972
R= Windsor plant

 

[Old Blue]

P= 400HP engine
2= 1972
R= Windsor plant

Thanks a lot for the information!!