Don't see a pic, but I'm guessing if you're talking about a regular Series II 3800, it could be a HVII (high velocity intake insert). It was an upgrade ZZP made in a couple forms for a few years in the mid-2000's (new version is supposed to be for sale soon).
The older version (HVII) mounted like a spacer under the UIM, while the HV3 was fully tucked inside the UIM in place of the original runner birdcage. (Called HV3 because the two "i's" were mistaken as a Roman 2, so they ran with it for updates, and new one will probably be called HV4).
The HVII (2) was a larger machined plastic base plate under those port openings, which is simplified in the HV3 (what you pictured, and what I have). They've mentioned an HV4 in their podcast on YT a few times in the past year, so I'd expect it on sale in 6-12mo.
They focus more on the newer small GM engine crowd than 3800's for a few reasons: they're the only large vendor left for 3800's, owners of their other platforms aren't as loyal/limited, 3800 products/market peaked as far as performance and they offer more than what most customers ever require, most employees (especially the social media ones) arrived after the 3800 peak years and only focus on the other platforms, etc.
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