Thanks to everyone who responded to my question. I really appreciate the help. I called Weber and talked with a CSR. We ended up talking for quite a long while. He confirmed that there has never been any changes made to the lid holder of the 26.75 kettle, confirming what I had believed.
On a side note, I had done something that I had never done before ever: I took one single picture of the inside of "The Vault" in my basement and sent it to the Weber CSR. He couldn't believe what he saw! He sent me a bunch of small free Weber products for being such a loyal Weber customer. In case anyone is wondering, "The Vault" is not actually a vault (That's just what I call it). It's a very secure, locked room in my basement, concrete walls on three sides, packed with every vintage Weber accessory you could ever imagine. Only my wife (and the Weber CSR) have seen the inside of it. It's about 6X the Weber product I have in my garage - packed to the ceiling.