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Does anyone Have the parts break down for the front axle on the 4x4 specifically with part numbers for the outer gear case?

I was using my Cat 303.5 Mini Excavator this week when the a track link snapped. Can these links be purchased separately without buying an entirely new and expensive track? Can I find a link for a 303.5 or compatible Cat in a used or salvage yard? Any names to try? I noticed that each of my...