Faucet repair

I have some questions about Epic faucets. My house came with mostly Epic plumbing fixtures, although the some are Delta. As far as I can tell, Epic is (was) made by the same parent company as Delta, but is (was) "produced for the decorator markets," at least according to SEC filings from 1993, which was right before my home was built. Other than that, I can't find any information on Epic faucets.
The fixtures in the master bathroom and kitchen look similar to the fancier Delta faucets. I was able to rebuild my kitchen faucet with Delta parts, and everything seemed the same, except the odd sized hex set screw.
For the master bath, the cartridges look like Delta cartridges, except they are brass, and the ones I see in home center type stores are mostly plastic. But the cartridge is not 100% compatible. They look similar, but the plate at the bottom is thin on the ones I see in the stores, and is thicker on the original. If I try one of the replacements that I can find, it goes in but it leaks.
Is anybody familiar with Epic faucets or know where I can get information on them? If not, does the cartridge I have sound like one that others have seen on other Delta faucets?
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Wai Doan Hsu wrote:

<SNIP>
http://www.dinapoli.com/services.html lists them as available parts
No guarantees...
Jim
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I found that link before I posted here, but it did not have any useful information.
Does anybody have general experience with Delta cartridges that look similar but are not interchangeable? It's possible that they designed new cartridges just for these faucets, but I hope not.
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