While I don't remember the Vanderbilt tender from Dimi, I do remember the one that George mentioned. Not sure why, but that tender was hard to find as it was packaged separately from the plow. Occasionally the bunker part of the tender does show up for sale, but good luck finding the whole thing now-a-days.
I have built two of the plows and had to source my own tenders. This was back in the mid-80's.