Tuning Walther lp53 piston head seal size !?

Hello ,

I want to ask about the exact dimensions of the PTFE piston head seal and the metal centre as the original seal is almost gone

So I can make another new one using a leather 

83ce599b8c6848a3a2c54e60adb7db30.1653610246.jpeg
IMG_20220523_230520.1653610248.jpg


IMG_20220523_230449.1653610429.jpg