I don't know about those kits, but I have gotten other kits in the past. Like others mentioned, I found the brass bits so far out of spec as to be useless. I thought the same thing, I'll just use the rubber stuff. I found that the rubber is poor quality, shrinking and hardening in a comparatively short time. So that was a bust too. So as long as OEM is available, I get that. Buy once and cry once as they say.