The International Cessna^® 170 Association

I'm trying to go back to the original elbow spark plug terminals, but I'm not sure which ferrule to end the wire. Any help would be wonderful!

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Dennis, The High Tension Harness Manual is found in the Maintenance Library here. Here's a snapshot of what you may be looking for although the elbow you've pictured is slightly different. It has a knurled nut on one end of the elbow where the one is the illustration looks like it has the same hex nut on both ends:#49 is a ferrule, p/n 10-620011. Aircraft Spruce has them for $35 but an internet search will get you a better price.