Shop Manual - step 8 - Installation (steering gear assembly): Install mast jacket to instrument panel grommet, bracket and spacers, if any.

I would have thought that the spacers are between the bracket and the dash, not between the clamp pieces.

red450IP - what part number and what vendor (for the rubber)?

There was a 1747-1953 rubber bushing and a 1954-1955st rubber bushing.

It has been a while since I worked on a 47-53 steering column, but it should be noted that the FAM mostly shows 54/55 illustrations/parts (this might not make a difference, but it should be noted).