I would cross it to the OEM number of 30700-KR3-670 to make sure you get the correct ohm cap for the coils. The OEM's cost about $10.50 each from hdlparts.com or the NGK's run $7 - $8 each from aftermarket suppliers. I think the Seafoam is 3 - 4 oz in the oil and 1 oz per gallon of gas. Run it a couple hundred miles and drain the oil. Better double check the amount for sure tho.
Why don't you run out to the HDL warehouse there in Hendersonville to get them cheaper than at our favorite dealer up there. Terry prices stuff as high as he can sometimes but he's a good dealer and can get you just about anything for any Wing.
Got a reply email from Randakk. He stated that 82 and later GL1100s used resistor plugs and non resistor caps, but NGK made no non resistor caps with the right geometry. Don't know what the effect of running both resistor plugs and caps would be.