[R-390] CY-979 and CY-979A differences + shock mount question

[Christopher J Galbraith]

Hello gang,

Are there any differences between the CY-979 and the CY-979A cabinets?
I am guessing the non-"A" was made during R-390 production and the "A"
during R-390A production.  All photos I've seen show the two models as
otherwise identical.

Also, anyone have, or know of a source, for shock mounts for these guys?
I have a CY-979 to use with my R-390A, and would like to find the shock
mounts.  I'd also be interested in trading for a CY-979A if someone
needs a CY-979 to be more "correct" for an R-390.

Thanks!  73, Chris KA8WFC