You sort of missed the point of my original question. What I have is an OC 12 with rubber block pads, or grousers. There are no steel pads to build up. What I'm thinking of doing is buying grousers that fit some other brand of crawler and re drill the mounting holes, or maybe get lucky and find ones that are real close and get away with just moving the holes a bit to match what I have. I'm aware of Zimmerman, and don't want to pay his prices as I'm sure I could buy new aftermarket pads for less than  he would want for worn out Oliver ones, if he even has any.