I just went to home depot and bought grade 8 hex bolts 3/8" x 3" as well as grade 8 washers since the bolt head isn't nearly as large as the stock one. I also picked up rubber corks there which I used to fill the gap on the non-nut side of the coilover due to the fact that the bolt I got is not tapered as the stock one is.

I have not found somewhere selling the tapered bolt that would be the perfect fit but then again I haven't had the time to search around really. If anyone finds somewhere selling it please let me know. Otherwise the next time I am free and don't need my car for a day I will be finding a machine shop, taking off the rear lower strut pieces and taking them in and having them redrilled for the stock bolt.