Whats the specs on that skimmer? I'd replace the pump with a shark pump ( modified sicce syncra) They're better than the psk pumps.
Try asking for Tom at Socaltropicalfish.com Tom doesn't own the store anymore buy he still knows the owner, he may be able to get you a oem pump.
That Eheim pump is usually bulletproof. What went out on it?
Have you emailed Victor at ATB? Like the previous poster said what's the problem with it? You can get parts for that pump still and piece it together.
I can get ahold of victor for you are you looking for the the pump and impeller or just the pump......I don't think he will have it but I will find out......