So I take it that the additional urethane inserts that you see in most of the kits that just slide into the original rubber mounts are also illegal. You are not replacing or modifying just adding the urethane material in addition too. Of course it is not specifically listed in the rules as a approved mod. therefore no deal. I really find it strange why we can't get it changed. It's not like you cant buy a full kit for just about every car that is spec'd. I'm sure there are some though. I would imagine the reasoniong behind it is because it would be hard to police and some people would be looking into solid mounts versus inserts versus urethane etc.. etc..