Did you ever figure out how to get him to eat it?

Man, I've poured so much bad self-leveler I could've tiled my whole basement with the chunks.

Yeah the old numbering is a mess. Best thing I did was save every cross reference chart I could find and dump them all into one spreadsheet, so now when I hit a part number that looks like gibberish I just ctrl+F it. Suppliers don't always keep the old codes linked either, so you end up bouncing between their site, an old paper catalog, and some forum thread from 2009 to make it match. If you can find the original manufacturer number and not the Frigidaire label, that usually cross references way easier since the OEM kept using it after the renumbering. Worth keeping that manual too, half the web stuff for these old units is wrong or dead links.