I’m afraid I can’t be much help here, as I can’t remember which was the “slightly tapered side”. I do know that I did not use any sealer and it does not leak, but then it spends all its time in the garage. Hopefully another bolter can help.

1941 Chevy Master 3/4-Ton
In the Gallery
More images in the Bolt Bucket

Born to fish, the truck is only a hobby.