It may be a little more money, but it looks a bunch nicer than a flat, square piece of aluminum. Looks like it's worth every penny. Looks like this type runs $550 here:
http://www.riley-auto.com/ADAPTERS.html
And the TCI is $471.38 here:
http://www.race-mart.com/TCI-TCI-149160.html
I think the Wilcap is $80 nicer.