Before i had I.S. i carried a grade 8 bolt with nylon locking nut with me as a spare. I had a wet bolt break while traveling and did not find it out until i was parked in the drive-way getting ready for the next trip. I ordered a wet- bolt from dealer that would not be in before i was ready to leave so this is how i decided on the grade-8 bolt. I believe it was 4 1/2''x5/8'' .I believe the grade 8 bolts are better than the wet-bolt grade 5's.
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