I've seen the same sort of thing, IIRC, it was called the "BackPack." Using one of those or a faked up version of it was my plan for hacking a Color CRT into a Compact. That's the slickest way to hide the extra length of the CRT Assembly, but it's just a smidge too shallow for a 10" VGA CRT's neck.

Great pic, where'd you find it?