OP back again. Thanks again for all of the info. When I get some spare cash, I will order some OEM's.
For some background info, the reason for my OP here is that on a cold day (30 F), I had to take one of my dogs to the vet for getting spayed. I put her crate in the back of my T4R, and in the process of doing that and picking up her 54 lb to put in the crate, my tailgate kept dropping down and I very nearly clocked my forehead a few times.
Back in the day, I cheaped out on stuff, at the expense of extra labor. I probably had to do something to the mounting brackets when I put my existing aftermarkets in about 12 years ago. The older I get, the less HASSLE I will abide, and I really don't want to go searching for parts and maybe modifying them to fit. I want to bolt and go. Plug and play. Grumpy old man syndrome. Finally, if it comes a time to replace the new replacements that I will get, I won't want it to be from me, as I will be between about 62 and 70 then (if my T4R is still running by then). 5 year struts might make it. 19 year struts will definitely make it, and when I sell it, a properly working tailgate on a dinosaur will be a bonus in the sale.
Finally, on an unrelated note, my upcoming emission inspection will be my last on this T4R. Beginning in 2024, I will no longer have to have it inspected, as it will be considered an antique here in GA.