Now that my attention's been drawn back to this thread, more on the 'Marvel Premiere Classics' special features issue:

MPC #52 was the last of mine that had OHOTMU pages as features, and I'm now up to #58.
The Alpha Flight one will be #66 (two gn's before Dr. Strange's first, btw!)

What they have been doing lately is reprinting 'extra pages' in the back - pages that were meant to align the page count properly in previous trade printings, so that two-page spreads would still be two-page spreads (I noticed with one of them that they were probably meant to replace double-pages). When they exist, of course.
That doesn't quite apply to the Classic X-Men pages, but it's the closest I've got.

- Le Messor
"I have understanding... of digital watches. And soon I shall have understanding of videocassette recorders and car telephones. And when I have understanding of them, I will have understanding of computers. And when I have understanding of computers, _I_ shall be the supreme being."
~ The Evil One, Time Bandits