Ebay link for bolt probe o rings: https://www.ebay.com/itm/203585407975?mkevt=1&mkcid=16&mkrid=711-127632-2357-0 https://www.ebay.com/itm/203643985662?mkevt=1&mkcid=16&mkrid=711-127632-2357-0
these are only 70 hardness..... originals are 90... Found these on amazon https://www.amazon.com/gp/product/B07D9MTKG4/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 ..
O- rings for the .22 avenger pellet probe https://www.ebay.com/itm/203526035584?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338273189&customid=&toolid=10001&pub=5575378759&icep_ff3=1&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg