I'd look twice at the Radio Shack part, it doesn't seem all that robust! This is a transformer that delivers up to 10 amps from each output, looks a bit anemic for the job. Don't know why it has such a low rating...
When I have a truly dead TIU, I just pull all the usable parts off, and the binding posts are one very useful thing I get from them. Several Z-4000 transformers have them now.