Replacement parts needed for the Passenger wiper assy

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According to the repair shop the wiper motor is fine as the driver side wiper works fine. But the passenger side is shot. I tried to tighten the nut but that wasn't the problem so I took it to the shop. Apparently the assy from the motor to the passenger side is shot and would cost over $300 in parts and labor to replace and fix: Im not paying that kind of cash for what seems to be an easy replacement. I realize its time consuming to remove the plastic cover to get to the the entire assy but am willing to DIY if I can find the parts. I have tried various sites to get the parts: all say 0 results. Where do I look to get parts needed for this task?