Will do a valve lash inspection and plug change on my 2004 R1150R soon. I seem to remember a good number saying that Autolite spark plugs are a better choice for oilheads than the Bosh and NGK I've been using. Is that still the consensus? Also two versions are listed: Copper and Xtreme Sport. What's the difference and what would you recommend? Does Bemmer Boneyard carry them?