I kept mine when I disassembled my cuda, I couldn’t re-use them because they either broke or were too brittle to use again, but they weren’t Ziebart, they were Tuff-Kote Dinol. I kept a 5/97 issue of MCG when the did a article on a cuda with the same rustproofing, called it “drilled and filled” . I think Dinol was absorbed by Ziebart but they show they’re still in operation in Singapore, google them and maybe they can answer your question? They have a FB page it looks like, I took pics of my car for proof/reference. Good luck.