That was about 2001 for my mail vehicle. I actually cut up an extra PDB to cut two up and epoxy the relay section from one into the other, replacing the large fuse section. I needed nine relays, two are inline in the trans wiring, which made it a 2 speed trans when a switch was activated.
I liked that method of wiring better than aftermarket parts. That allows you to swap other stock relays or fuses if needed, and if you carry extra items, they work for both.
For my 99 Explorer project years later, I only used one small auxiliary relay box, and made use of unused "holes" in the stock PDB. The smaller relay boxes are easy to find, many Fords have them under the dash, in quarter panels etc.
I started with one from under the 95-01 air cleaners. They are all modular, you can take them apart(difficult) and mix the components. You can make small boxes half of this size, or a square double this size, or larger if you need to.