I beleive that mine is also for a 67-82. But it works fine with a '65-66. Just be sure and cover the chains that go under the master cylinder to keep them from rubbing the paint off (if that matters). I just went out and double checked the bleeder to the master cylinder fit, and it lines up correctly. I thought I used the one for a '67 and it worked fine and it will. I am 100% sure that the '67 bleeder will work for you. That bleeder was the best tool I have ever invested in. I restore 72 and earlier vettes and it has saved me a lot of time and you can do it by yourself.
Jeremy
Jeremy