Tom from SWISCO responded:
July 1, 2020
Hello, Neil. This does look like a drawer spacer, which is what our 32-339 is. These are very simple pieces that just keep the track stable and in place. They aren't super complicated. As long as your spacer is 1" deep, as indicated in the diagram below, then it should work for you. The only thing you'd have to worry about is maybe having to drill new installation holes. Alternate image for 32-339
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