Unfortunately all I’m seeing is the whole caliper or the seal for the piston, which seems to look a bit different. This is the part number I’m finding. 34206786064
Another option would be to go to a local industrial supplier like Grainger or Fastenal and see if they can measure the oring and match it. An issue here is not knowing exactly the makeup of the rubber material. It can swell or be damaged if you use the wrong rubber incompatible fluid. In industrial applications where I work, Viton is usually specified because it’s more resistant to various additives in hydraulic systems.
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