Athearn BB kits -generally- used 33" wheels with the longer 1.006" axle, but that wasn't always the case, especially since the run for BB kits was rather lengthy. Honestly, the best way to be sure is to purchase a 33" sampler set, which is very affordable, but will take all of the guesswork out of replacing each and every single wheel since you'll have both sets to use as a reference for each replacement job.