The gentleman you need to talk to is Mr. O.G. McDonald who owns two beautiful 62 M Series Tbirds which he's beautifully restored himself. He's a friendly and helpful guy who also serves as the "Concours Director" for the Vintage Thunderbird Club International. He can tell you what is (or isn't) factory correct on your M Series and help you locate what you need. Send him an email at "
[email protected]". Best of luck.