LLK 150ps PD | Posts 16+

That's correct . For me, it was 19.5 -> 19.2. I only mentioned it so that you can get a rough idea of the scale.
"Items 1 through 3 are definitely usable, while items 2 through 3 might provide some peace of mind."
Therefore, it should be possible to see which gasket is inside, even when it's installed. Use the parts search function to find parts based on thickness, and then specify the thickness of the thickest gasket (if it's not already the thickest).
As mentioned before, the dimensions are listed in the excellent VAG spare parts catalog.

Best regards, Rainer.