When I was changing the CV boots on my 04 GTs , I noticed my one of my upper boots was torn, and the other was developing cracks. I didn’t want to replace the upper arms as the joints where still holding grease and where tight. I started searching the internet for replacement boots. After quite a search I came across Specialty Products Companies replacement boots for Audi upper control arms, part number 81354. They didn’t have dimensions but the looked the same. They where $12 for a set so I ordered them and gave them a try. Once I received them I put them side by side the look to be identical except the new ones have a slightly smaller inner diameter. I filled the but with new grease and it went right on. I used the new snap ring at the top and used the original on the bottom since it was much easier to install. Hopefully this will be ove some help to others.

Old boot before removal

New boot installed

Both boots replaced, and I know the nut hasn’t been put on yet.

Side by side , new on right

Side by side, new on top