As far as I know the assembly is not being mass produced. I did read of a small batch (10?) being made a few years ago but I doubt any are still on a shelf. I expect you'll have to settle for good used ones and they are somewhere between hen's teeth and frog hair on the scarcity list.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.