New Gx470 Owner With Spark Plug Question?

[va470]

Hey guys I have finally left the german scene and bought a Lexus. It's an 04 gx470 with 78,000 miles but runs like new and was a one owner car. I know they call for 120k before changing the plugs, but I just can't wait that long so I am going to change them now. I know the OE are Denso Iridium SK20R11 but I ordered Denso Iridium IK20. Are they pretty much the same? Will I have an issue using them? Also they have these Spark Plugs Tube Gaskets, where do they go? I took out one of the plugs and did not see a gasket. Thanks for the help guys.

[mann777]

visit www.sparkplugs.com , on DENSO and you will have the answer. I recently had the change done, bought from sewell and it did not have one, so i presume they are standard issue.