Hi Charles -
Another place to find chimney mounts at a reasonable price would be here -
http://www.antennapartsoutlet.com/Pa...neyMounts.html - Easy Up has a web site, and apparently they are a supplier of the generic chimney mounts. I have bought a few things from these folks and the products were shipped cheaply and of expected quality.
I think you are on the right track to use multiple sets of the generic mounts to duplicate the Ronard product. It seems like 60% of the Ronard products that should be available are out of stock everywhere.