Magnum reseal questions?..

Matt bought a set of their retainers for his magnum, but I found their source for stainless valves and bought them a good bit cheaper.
I bought there spring kit (springs/retainers/keepers) for my magnum heads. I wish I could find the source for their spring supplier. Their springs are not larger in diameter than stock like the Comps that everyone uses. Retainers fit nice.