Even if you do contact them, they are pretty much out of those wheesets for SW1s. We discussed the spare wheelset availability in
https://www.therailwire.net/forum/index.php?topic=37191.0 (probably somewhere towards the and of that thread) and that was few years ago. There was only one run of these locos (ending in a "fire sale"), so whatever spare parts they had left, they are almost certainly gone.
When I was getting my wheelsets (back around 6 years ago) I was communicating directly with one of their employees. I'll PM you his email address, so if he still works there, you could ask him.