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i did some searching and found the ngk cut back plugs. summit has them , would require a .040 spacer , decent price but......none of them are R plugs. my wires are R but based on what i read on ngk's site, R plugs are to combat emi vs R wires are for rfi. for some reason i cannot look that plug up on ngk so i will have to call and ask if the make a cut back R plug.