Here are a couple of photos of the rear door sill with the tube to access the tire carrier. These are from oldblue51's album. I have bought this part from him. To be absolutely correct I should have the one without the hole/tube for my '51 burb, but this is what I could find.
underside of rear sill Top of sill Oldblue51 is where I got the info about this hole being used to access the tire carrier.
Kurt
