I wonder if someone can help out with this. One of these days I will need to feed the ignition wires through the baffling I am making to the plugs. But first I need to buy and then install the spark plugs. I went browsing the ACS pages and noticed are many varieties. I narrowed it down to Champion and massive electrode (if you want to call it "narrowing down") There are 14 results for my narrow down. I have a Lycoming O-360 Please point me in the right direction? Thanks.