Some more observations on the '55...
The rear wheels appear to be deeper than the front ones, suggesting they are reverse-rim wheels;
Finding dog-dish hubcaps might be a challenge;
It looks like there's a tachometer on the steering column;
I think there's a shoulder harness/seat belt retrofit (look at the post between the door and the side window).
These aren't huge deals, but might impact your choice in kits.