Some of the more larger Mustang Parts suppliers should have it, try
www.californiamustang.com or
www.dallasmustang.com. Mustang Parts of Oklahoma may have it, i think they are
www.ilovemymustang.com.
As for value, I have no idea. Back in the 80's when I first got into the hobby, Mustang Monthly was in love with the T-5 and you read about them all the time, I haven't heard much lately. You may try writing to
www.mustangmonthly.com and ask, someone may know.