Denny, just a though on your vibration problem. If I'm not mistaken, the original wheels are a relatively tight fit to the hub, which would make them a hub centric wheel. That would be the hub is what the wheel centers from, not the lugs. IIRC, the wheels you currently have on it do not fit tight to the hub. This could be the problem. I have run into this problem before. On the cars I deal with, adding a hub-centering ring solves the problem. However, I'm usually dealing with aftermarket custom wheels, so that wouldn't be a direct solution for you. But perhaps you could machine your own, sized to fit your hub and wheel opening. Aluminum would be a good choice, many of the aftarmarket rings I use are either aluminum or plastic.
Just a thought anyway.
