I used the 7" round LMC Halogen lights on a brand F PU. Also the relay kit. Big improvement. As mentioned above I did have to cut a bigger hole in the back of the headlight bucket.

I fed the relays through a 30 amp breaker (parts store) and 10 gauge wire. I had to lengthen some of the individual headlight leads with 12 gauge wire to get wire routing I liked.