Sorry about the CRTs. Are they both 21" ? Seems those are far less reliable the the 17" ones.
Odd that the Admiral has a split chassis. From what I've seen the 20X122 has the gold bezel and uses a single chassis. The 24A12 with a white bezel has the split.
If you do part it out, the HV cover looks like the one Kevin needs:
http://www.videokarma.org/showthread.php?t=251726