LOL, this is getting bumped as much as your cartoon girl's.......... ahem...
Are you measuring the 5.5" the outer edges of the lips of the rim or trying to measure/estimate this width where the tires bead seal? (The latter is the right way..)
BTW, I am pretty sure the '63 Fury (B body) used the 4.5" diameter pattern.
I could use a 5" wide rim of this type.....but the dish diameter is too small.