Just measure a reasonable amount of space forward of the top hole, and match the measurement on all sides. Mark it with a sharpie. Use a dremel and a Carbide porting bit (about $25 for a good one from a tool shop, try mcmastercarr). Make sure you use cutting oil, and keep an eye on the temp of the strut body, that way it is not too hot, they are gas filled. BTW you only need to hit the top bolt.
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