Thanks for the comment about a dealer installed option. I looked through the paperwork I got with truck and there it was. The AC was installed by ARA of Phoenix when new. I do not know if they are still in business, but I sent them an email asking about the part numbers I had.

http://www.arasourcing.com/motor_vehicle_air_conditioning_driers_acumulators.html

'88 Dodge Raider with only 52,000 miles!
My upgrades:
Curt 2" receiver tow hitch
Re-undercoated the wheel wells
Gen 2 padded center console cover "armrest"
Highland all-weather front mats
Double DIN JVC Receiver
Power locks with remote