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Can anybody tell me the size of the O ring I need for the caliper joint on an 1983 31/2 sport please ? ordered a kit off Mdina and the piston seals are fine but the joint O ring that came is 10mm and mine is 12mm but I need the thickness, I can’t drive due to an op so will have to order, and am I right in thinking it’s a viton for brake fluid ?

Thanks for looking
barney