Where can I find a flash guard?

I've rounded up a King Sol, and a Heiland flash gun. Neither came with flash guards.

As any flash bulb I'm likely to use is fairly well aged by this point, I worry about exploding flash bulbs.

I've searched eBay under flash guard, flash protector, flash cover.... Anyone have an idea as to what else they may be called, or someone who still sells them?

Thanks!

-alex

See if you can find some of these; (elastic edged bowl covers)
http://www.wdrake.com/WalterDrake/displayitem.aspx?id=312261

The cover would need to be large enough to not contact the bulb, but other than that should work fine, and they are very similar to some guards available when those flashes were actually in use.