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If they are physically different ?? longer, different thread , different head size, different length???then the threads must be also. I would think that the bolt that goes in there the easiest would be the one that belongs there. do by hand first not to strip it 5/16th and 3/8th by three turns you should know it doesn't belong, clean them both up with wd 40 wipe off and you should be able to tell. good luck. next time lay out bolts in box 1st to last in order you took out then no worries..
Yeah that guy has a great website, I have flipped all through it.
Thank you but It still leaves my question unanswered.
I just need a live picture of it.
Mine has an 8mm head. Just had it out a couple weeks ago.
As someone else suggested, see which one screws in the easiest and move on with life. If that's too hard, take a side-by-side pic of the bolts and post it. I'm sure someone can answer. A physical description of the bolts would be another alternative.
Just had mine out a couple of weeks ago. No picture, but it is a short bolt and I think it is a black one too. All it does is hold a little fork like bracket that keeps the sensor in the hole, so it should thread in easy. If it bottoms out and that little fork clip is still loose, then you have too long of a bolt and will strip out the timing cover if you try to force it.