I would recommend searching on the Lionel Replacement Parts page for the particular product number for the set the locomotive was included in, or the locomotive itself if it was a separate sale item to verify that you're getting the proper parts. They've made a few different changes through the production of the 0-6-0s, so make sure you're getting the parts for your particular version.
That said, the wheel-sets do appear to be available for this particular model so I have the feeling you'll be able to find what you're looking for.
https://www.lionelsupport.com/...1b-858b-f8e6d3ae4115