Zenith 22-5001 safety caps problem/question

[kx250rider]

Subject: ZENITH safety caps; the signle-section 22-5001 that was used in the 25CC50 through 25EC58 Chromacolor before the upright chassis with the 4-lead cap...

I never thought I'd have an issue getting these, but evidently they're hard to come by. Laughter broke out across the phone order room yesterday when I tried to get some from Andrews. Strangely, I've never bothered to look into what the value is on these, and if there's anything "special" about them. They just have the part number and "special cap" on them. As any of us who worked on Zeniths years ago know, you're on borrowed time before the high voltage goes zzzzzzzzzzzzzzzzzzZZZZZZZZZZZZZZZZT!!! and the neck falls off the CRT, when you still have the white ceramic ones installed.

Does anyone have any experience on what if anything can be used in place of the originals?

Thanks, Charles