Stenner Tank STSCAP Replacement?

Hello folks! There was a very old thread on the same topic, but I didn't want to dredge up a thread from 2017.

I have a Stenner 30 gallon acid tank that's in good shape except for the lid. The lid is thin and falling apart after a few years. The Stenner part number is STSCAP and goes for $30+. That's a bit steep for a flimsy piece of plastic. Has anyone with a similar issue found a 3rd-party replacement that fits? If not, I'll just suck it up and buy the overpriced OEM lid.

Thanks!