I used the Mar-K link assembly as per Kevin's post. They worked well. You have to cut a lot of material off the tailgate, which is a bit concerning, but's it's OK.

I believe Mar-K also sells hidden latches. I used latches from a marine parts supplier. Only issue is that the hook part of the latch can catch you if you use the tailgate as a bench.
Attachments
Box Side 16Nov2017.jpg (48.48 KB, 275 downloads)
Rear Bumper No Plate.jpg (171.29 KB, 195 downloads)

Last edited by Gord&Fran; 12/05/2020 9:10 PM. Reason: obscure plate

Gord 🇨🇦
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1954 1/2 ton 235 4 speed