The DL380e Gen you have is the "Storage" model that has parts that are not included in the standard (non-Storage) DL380e Gen8 model.
As I mentioned earlier, you need the entire Drive cage and Hood (not only the drive backplane). HP cannot send you parts from one submodel to make up another submodel because, those part numbers are not even listed as replacement items for the unit you have.
Try to return that unit as a whole and then, get the DL380e Gen8 base model plus the P420 card.
BTW, I was finally able to get ahold of a Primary Riser with SAS and I see no major difference with the temperature of the P420 card. I was only able to lower the FANs to 33%. Any lower FAN speed causes the P420 temperature to increase towards 90ºC.
