I took an old spark plug with me to Napa last Monday, the man behind the counter read the number that was stamped on it. He and came up with a cross reference number for Autolite spark plugs. (Autolite 2344) He showed me the picture of it on his computer, looks the same. So I placed some on order. I picked up my new spark plugs from Napa Friday after work. Saturday morning I started working on the motor, change oil, fuel filter new points, condenser, drained the old gas. Etc. Etc. Then I started to install the new plugs and wires. Set the gap on the plugs. I installed the first one then the second one. Something looked odd, but I could not place it. Then I tried to screw the plug wires on. I could not get the nut to turn because it was hitting the wire next to it. I know they are close to begin with, but this was too close. So I compared one of the new plugs to an old one, and the new one was 1/4inch longer! Has anyone ever had this problem? I hope Napa takes these back. There is no way they will work.