truthinbeer Ford Falcon EB bonnet strut. You'll only need one.
And this is why tailgate hinges get destroyed. If you put a super-high pressure strut on one side only, all the load will be going through the one hinge, and it will also be putting a twisting load on the tailgate. Sure, it may hold the tailgate up, but would I do it on my car? No, because new hinges are about $250USD each and I can buy 2x original design new tailgate struts for $60AUD.