Lots of people out there would like to have spindles for these!
The 72-93 trucks use the same spindle on 1/2 tons. the difference is the rotors. Later trucks have bigger bearing diameter rotors.
Yes the 84 is the year spindle that you should spec.
By no means is the market dead. Look on fb for 72-93 truck groups. There are several, and with huge memberships. One of the biggest issues with these trucks is the lack of readily available parts to drop them with. Suspension geometry gets crazy when you use drop pocket lower control arms, things get dangerous in a hurry when done wrong,with shorter springs, not to mention ride quality ummm suffers.

O.G.