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Yep... TR6's are good but, usually have to order them at the parts store. Gap around 0.035". 104's are good too and usually around $1 at just about any local auto store.
Nobody uses Champion plugs anymore? I always use RS12YCs and I might go down to an RS9YC this summer. I had TR5s in my car but they kept fouling out anytime I was on the transbrake and the 2 step.