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Well technically you can buy them. I know of one place that has a couple from trucks that they scrapped, but it would cost a ton to ship due to being over-sized. I also have a spare assembly in the yard, but again, shipping would be an issue. You can build one for maybe $100 in metal.
But yes...
I didn't notice this question until now. They are not commercially available. They only came on the Canadian M35's (MLVW's).
But you can build your own. Here is a manual showing you how to do it.