Yeah....trying to avoid the seams on the vinyl wraps and looking to find 6x6 sleeves. Finding plenty of 4x4 sleeves, but 6x6 seems to be a challenge.
I've been told that the weight of the Pergola should keep it pretty stable and that the purpose of the mounts is what you suggested, but just would have felt a whole lot better if I could find some that could provide plenty of support and went up the post a little higher vs just low ones that will only keep them from moving if someone leans on them.
I have decided to stick with the wood posts vs the steel beams used in some of the vinyl kits i mentioned originally. Getting a little closer to getting started finally.
Still checking back, in the meantime, to see if anyones used these post mounts for a Pergola and how they've held up.