Does NGK make an Iridium TR6?

I have a brand new set of Iridium TR55s, but with my mods I really (think) need a set colder and was going to go with Iridium TR6s but can't find them.

Or...what plug would you guys recommend for an 11:1 head and cam LS1?

 

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Thanks...oh and I found them online, but I'd rather buy locally where you mentioned.
I don't know why my first google only returned standard TR6s?