If you just compare the thickness of a brake drum with the thickness of a brake rotor, the difference is about 0.125" (1/8") per side--the brake rotor hat being thicker than the drum by that amount. This is the difference you will see using WRDC.
If conversion is accomplished with a spacer or longer axle shaft (to use OE B-body rotor/caliper package), the difference is closer to 1/2" more per side overall.
If you were to fit a sedan axle into the wagon chassis--which I do not recommend--both versions of the sedan axle assembly are considerably narrower than the wagon--1642.5mm vs 1598mm (Impala width) or 1566mm--23.75mm or nearly an inch shorter per side for the Impala housing, and another 16mm (5/8") per side for the narrowest housing.
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