For me a lot of time it is easier just pay an outside vendor or use AAA. The vendor than fights the battle for you, usually 30 to hundred bucks, depending on what is needed. Well worth it for me.
I had set done on the 64 880 few years ago, about the same time frame. What I do not understand is if they give you a lead time of a year, why that never seems to be met?
Was looking at you tube video on making holes in carpet for the bolts etc. They used a heated socket, I used a heated hole punch. Goes right thru and no fraying, seals itself.
Quirey Quality Design Did make the headliner, chk with them. Did my 64. the wheel wells I covered in vinyl, and I put carpet inserts on the sides and floor.. SMS door panels, have a drink every time they miss their deadline. You might need a liver transplant.
Slightly off topic, this is a 64 Buick service car, conversion by Flxible Co. looks like it started as a wagon but is a 4dr sedan. Cheaper to start with a sedan than wagon.