I have a 1992 F-150 and curious of the preferred package #507A, how common are they and also how common are front limited slip axles?

Some Options for my truck:
preferred package 507A
351w
E40D
manual hubs and manual transfer case
skid plates
limited slip front and rear

 

Believe all of those are fairly common except the front limited slip. Don't see those very often from the factory. Had one in a 3/4 ton bricknose, I liked it in the snow.