I actually did the same type of tutorial for The GM coil conversion years ago, sent it to "David" and it was posted from: "Bob form Canada". The coil was from an '88 Pontiac Grand Am 3.8litre. The choice was based solely on getting the correct resistance with the stock ballast resister. I had to randomly remove several coil-packs before finally choosing this one. It sits in the tool tray as in the similar article I believe you are referring to. I used for 1/4" nylon bolts to hold it to the tray ( The coil pack mounting holes were the correct size for tapping for 1/4". The wiring was very strait-forward. connections were all soldered and "shrinked".