VTL Binding Post - Sources?

I have a pair of VTL MB-450 amps who's speaker binding posts have become brittle and are starting to crack. I'd like to replace the posts and thought I'd check to see if anyone knows where I might find a direct replacement part of equal or better quality? Even a part number if known.

I've called VTL but they are still checking to see if they can sell me the parts and how much they would cost. Thanks for your help.