Yes, my uprights do inddeed lean inward. The outer diameter should suffice, I presume the ID will depend upon what gauge tubing Metal Supermarket can provide. I will take one frame side with me for fit. And, the ID should be just a little over the OD of the uprights for a snug fit and no rattle. And, if I do end up with some slop, presume I can apply some undercoating paint or wrap the upright with a layer of something to increase the OD of the upright and provide a snug fit. I will post what dimensions of tubing I end up with for future use. I do not have my canvas top yet, New Life is backordered until August of this year, so I may bend bows and leave a little extra on the side legs until I get the canvbas and will cut to fit. Although the NOS specs provided above and New Lifes reputation for providing accurate products should make this last step unnecessary.