This happened to me and at the time the only way to fix it was to braze them back in. Brazing was used so the brass could be melted and dripped into a very tight area.
I suppose that now you could use panel bonding adhesive...maybe.
The modern replacement for these shocks should be an electric self powered lift like we see on SUV's opening the rear hatch. Not a pressurized cylinder that constantly loads that area of very thin sheet metal on a very expensive to replace deck.
Send Jon Haas at Pantera-electronics a message telling him you want them. He has a set now that works off of an air compressor but that's already obsolete. The self powered electric ones are what is needed.
It's gonna take more then just me to talk him into making them. Maybe if there are a dozen or so folks interested he'll do it?
Don't be shy. Jon responds to market demands.