Hi Guys, I had an old O-Ring sitting around and was cleaning my DISA Valve on my M54B25 and for some reason, I decided to cut off the old seal and put the O-Ring I had, which was tight. I do have a rough measurements, but would like to confirm if any one of you know the exact size of the DISA O-ring

Is the internal diameter 2.0/2.1/2.2 inches?
Is the O-ring thickness 3.1/3.3/3.5/?? mm?

(One I have currently on is 2.0inch by 1/8inch thick)

Once the size is confirmed, I have a local company who can sell me the right size O-ring in Silicone grade. So, please confirm the size if you have changed it or know the size.