you also have 1xcd, I think those maybe tires?? hwy steel(belted?)
you might also check
www.73-87.com
I will take a guess at them though.. just for giggles. Though it would help knowing what type of truck it is.. I realize the VIN is there but dont have time to decipher it.
1D73: Pickup box side rail= possibly the rails that run the length of the bed ontop of each side..??
1F44: Heavy Duty Chassis E(equipement??) =possiblity a group of add on that include the heavy duty shocks and sway bar??
1ZQ2: Operate Convience package= Tilt, cruise, AC, tint .....