Maybe insufficient for your friend’s needs, but I just used one of the recommended Tire Rack installers today. A SoCal mobile installer called Rubber on Wheels. They put new Conti ExtremeContact Sports on my new Panasport wheels. No complaints. Spin balanced, not road force balanced. Anyway, the number is: 951.453.2522 and their web addy is
www.rubberonwheels.com
YMMV