Thanks for the pics MackDaddy...I tried a few bolts in that threaded hole, but didn't have one that fit. Any idea what the threading is on that bolt hole? Can I assume it's a Metric size and not an English one? Also, where did you run your grounds back to. Did you find a good enough ground at the central support, or did you run to the negative battery terminal, or elsewhere?
Lastly, When I ran the horns to the stock wires, I got a much lower than stock-volume out of them (no I wasn't running them in series). When I ran them direct to the battery to check them, they sounded fine (maybe my Supertones are pulling more current than the wires can supply...I cannot believe this, but who knows!). It seems that I'm going to have to use the relay. Anyone else run into this problem?