The other day I bought my doghead relay from O'Reilly Auto Parts for $9.99 in the lawn and garden section. We don't have a Napa in town and I hate that. Advance Auto Parts didn't have the correct one and didn't even have a listing for it when the guy tried looking it up by the part number. I put it on today, only took 20-30 minutes. It took longer to locate bolts and find the drill and drill bits to make an extra hole in the bracket than it did to wire up the relay. I didn't even disconnect the batteries (I know, don't hate on me, I am a professional. Don't try this at home). I simply cut one wire at a time and carefully hooked it up to the new relay. Yes, I like to live dangerously but I have been working on cars for 33+ years so I kinda know what I'm doing. Anyway, I love the SNAP when you turn the key. Thanks doghead for a great mod. Now I have three relays that can be sold on fleabay as A/C relays or I will save them for when I install the factory A/C system from my 78 C10 parts donor. Oh, I also discovered I had an under dash light while checking into some other issues and reading posts on the forum. Never knew that was there. The bulb was missing in mine, another trip to the donor truck and presto, I can see all the spare parts and other crap rolling around the floor, Yippie!!!
) 3) Finished project with all the exposed contacts covered with liquid electrical tape. Thank you Doghead for this mod. 
