CoronaRaptor
FRF Addict
They are probably in the wires already and in the ignition coils boots. I think what you are referring to is the kit you can buy to replace just the boots on the bottom of the ignition coils.The wire set I was looking at included the "pellet" \resistor with the wires and boots. I couldn't find any previous posts about it other than one mentioned that had corroded in place.
It was recommended that it should be changed along with the wires. Curious that those changing plugs and wires did not mention it.