The trussrods that Huffman used, were very similar to the ones that Westfield/Columbia was using.
The biggest cosmetic difference was the slight bend down at the axle, which can be easily done on a Westfield/Columbia set.
The trussrod bolts that Huffman used were the self tapping type, that can still be sourced from automotive hardware stores.
So, not that hard to come by, with a few modifications.
These are available on eBay as we speak.
View attachment 1682289
Maybe not the condition you’re looking for, but it just goes to show, that they are not that hard to find.