It looks like Nissan has used the same relays and relay holders for over the last 20 years. They're a modular design, which makes them excellent for retrofitting into other vehicles.
Here are the relays. Notice how they're color coded, and how the pins are nicely protected.
![Image](http://i159.photobucket.com/albums/t130/Begle1/Truck%20Parts/IMG_1214.jpg)
![Image](http://i159.photobucket.com/albums/t130/Begle1/Truck%20Parts/IMG_1216.jpg)
Here are the relays with their sockets; the sockets are also color coded. I don't know how to change the pins in them yet, but I'm very interested in figuring it out.
![Image](http://i159.photobucket.com/albums/t130/Begle1/Truck%20Parts/IMG_1217.jpg)
The sockets clip securely into these "ice cube trays"; then you insert the relays into the socket. As you can see, you can put whatever sockets you want in the tray. The trays are a pain to get apart, but the ones I dug out of the junkyard held up to the sun pretty well; they did come apart instead of just breaking. Once everything goes together, it's a pretty secure set-up.
![Image](http://i159.photobucket.com/albums/t130/Begle1/Truck%20Parts/IMG_1221.jpg)
I'm trying to figure out the difference between the blue/ grey and green/ brown relays, and what the amp ratings are of the different relays.