RPO (regular production option) meant factory installed option. LPO (limited production option) meant option on the factory invoice, but installed at the dealer during the PDI process. DLR meant an option or accessory sold and installed at the dealer. So this document was printed in the beginning of the model year. And all 390's were to get the chrome package. So, it makes more sense that towards the end of the model run, they probably ran out of the chrome parts. That must be the answer. And if it is, what was the cutoff date? BTW, Thanks for the link!