Topband: Vacuum variable capacitors

[D. S. Coleman]

GD All:
This winter, my shack will have a new heat and light source, thanks to
the warm glow of vintage 3-500Z's on Topband.  :-)  The downside is
that now my variable capacitors in  the the omega match of my folded
monopole will not be up to that kind of abuse.  I need to replace
those old cheese slicer caps with a couple of vacuum variables that
are 500 pF or so max and a voltage rating of 5 KV or better.  Would
any of you gentlemen have any vacuum variables that you would be
willing to part with?  If so, please reply off-list to my email
address below.
Tnx & 73,
Steve, AB4I
cwforever2 at gmail.com