Small cyclone separator bins

Apologies if this is considered off topic, but maybe a shop
worker knows where to find what I'm looking for.

For several years now I'ved used a small cyclone separator and
shop vac in an over-the-shoulder arrangement for outdoor cleanup
and sometimes confined space excavation in soil. Here's an image:
http://www.zefox.net/~bob/dustdeputy/portabledustdeputy.JPG

The problem is the lid on the plastic bucket: The buckets, despite
being throwaways, hold up fine. The lids, not so much. Usually they
crack at the outer edge. Even a tiny leak below the cyclone totally
disrupts the separation process and the lid has to be replaced.

I've looked for a better container for a few years and found nothing
suitable. A stout, wide mouth plastic jar with either a flat side or
a lid big enough to mate to the 5" bottom flange on the cyclone is
what I've sought to no avail.

Does anybody know of such a thing, or a workable alternative? 

Thanks for reading,

bob prohaska