Tuning Edgun lelya .20 1st gen help

Does anyone know where to find the size of the rubber o-ring that is on the pellet probe. It has 2 small o rings on it. I needed to replace 1 many years ago and thankfully Brian at edgun west sent me some for free but I can't seem to find the the extras. I sent Brian an email hoping to get a size to order some but he's a busy man I don't want to bother him too much. If someone here could help it would be much appreciated. Pics for reference

20211214_162507.1639517401.jpg
20211214_162443.1639517407.jpg

 
Does anyone know where to find the size of the rubber o-ring that is on the pellet probe. It has 2 small o rings on it. I needed to replace 1 many years ago and thankfully Brian at edgun west sent me some for free but I can't seem to find the the extras. I sent Brian an email hoping to get a size to order some but he's a busy man I don't want to bother him too much. If someone here could help it would be much appreciated. Pics for reference

20211214_162507.1639517401.jpg
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20211214_162443.1639517407.jpg
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he is the importer dont think it would bother him. its his job to service his guns he sells