If that company can't get them back in stock, I am sure you could make your own.
Here is a place that sell 4oz screw top cans dirt cheap that are rated for harse solvents:
berlinpackaging.com/4-oz-steel-flat-top-cans-1905t07 Those would need a small vent hole drilled in the lid. Pretty much the rest is just common barbed fittings, hose and some clamps. Perhaps a couple of o-rings.
It wouldn't be that hard to jig up something to make a bracket.
The existing/stock master cylinder cap can be drilled to accept the barb fitting and plug the vent hole. As your essentially relocating the vent to the top of remote reservoir.
Some epdm rubber sheet could be used to make atmospheric seal vent to go under the reservoir lid.
I'd also use black hose that is brake fluid compatible over that red hose.
It could be a neat little kit for someone to put together and offer to Packard folks.
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