there is a guy on tgr who can help you out i think.
corn dog
he got me a tt7 heel for like 10 bucks.
its a steel brake in it though, so it doesn't match color wise. but i could care less.
other than that though. you're sol i think. i have tried just about every way to get a hold of that brake and you cant because they don't make replacements for it. bout the only thing you can do is ask your local race shop if they have any old heels lying around. my shop had one, but they wouldn't let the brake go un fortunately.
e bay is a good place to. old tt bindings go across there pretty often. good luck man.