Keith,
You may want to try Carbotech in Florida.They make excellent replacement pads for Wilwood calipers (ceramic, metallic, a combination, what ever you want) with characteristics determined by your particular preference for wear, operating temperature, etc. and depending on your mix of street/track driving. You just tell them what you want and send them a tracing of your pad. Cost was in the $60 range if I recall correctly. Much improved stopping distance--wear moderate.
the address is:
http://www.carbotecheng.com/main.htm