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I'm not sure about the fit in a van. Make sure you replace that top bolt with one that's 6-8" long. If you use a lock nut on the bolt you can tighten the top bolt easily vs. using an extension.
I made a stud from a long threaded stainless bolt for the top one. Now I can hang the starter on it when I'm installing it.
I used stainless and JB weld so it won't come out when I remove the nut later.