Eric,
From the pictures, that looks like an excellent repair job. Please let us know how it holds up. Interesting that the tech thought it was an ABS-type material. If it ABS, I presume it could easily be glued with ABS cement. Who wants to give it a try?
Looks like you can buy the bumpers I suggested here:
http://www.acehardwareoutlet.com/pro...rce=GoogleBase
If you don't have luck there, let me know and I'll walk down to Ace I bought mine from and get you a few pairs. And don't forget to use stainless screws. You'll either put them in now, or in a few months.
Dave