Notice the thick washer? Notice the thin washer between that and the head of the bolt? Notice the length? See the blue goo on the threads? Yep, it’s a special bolt just for your distributor. Not only does it the lock into place to hold the distributor in the right spot for correct timing, it is also to keep oil from leaking from the cylinder head in that spot. If you look close, the hole for it hits oil in the cylinder head. Get the right one. No leaks, locks the distributor down correctly.