If I pick up a set of stock mag wheels that have the old style non-sealed bearings, can these be punched out and replaced with new style sealed bearings like the ones already on my bike? Are the openings in the wheels the same? I have a line on the 13 spoke mags I want, but they are from a 99 and have the old style bearings

 

Axle Info:
2000-03 Dyna have ¾” front axle, 2004-07 Dyna have 1” front axle (except 2004-05 FXDWG), 2000-05 Dyna have 3/4” rear axle, 2006-07 Dyna have 1” rear axle. 2000-05 FXDWG have ¾” front and rear axles, 2006-07 FXDWG have 1” front and rear axles. All Dyna have 25mm axles from 2008+.
Info from J&P Cycles Catalog.

Sorry no info on the older style. The bearing width is different between the 1in and the 25mm. You didn't state the year of your Dyna.