Unfortunately, I do not know a source for just the factory-style foam insert that has the slightly thicker foam along the edges and the thin foam across the center. The only way to get them, I've found, is to purchase the entire hygiene kit, and that's like $30 and includes the stock pads. However...
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I make a similar-shaped foam insert (seen installed in image above) and include it with my aviation-style headset gel pads (Stretchback Universal Mount). The foam is a uniform thickness and doesn't perfectly mate to the internal layout of any single headset, but it works perfectly fine on Sordin / Peltor because it's larger than the internal opening and is just held down by the mounting plate. I just haven't been including it with Sordin / Peltor because nobody's brought up this issue before and I didn't think of it. Perhaps I'll start doing that in the near future when I get more of the foam in stock. For now, if you'd like a set included with an order, please call 616-226-3551 / email
[email protected].