Left mirror on my 2019 CRV EX was clipped by a passing car. It is currently dangling by the wire but the sensor and the turning indicator still work. Only think broken is the cheap plastic arm that holds up the assembly. Is it possible to purchase replacement of just the plastic arm? A new complete assembly is over $700 and a used one I found from reputable used parts guy is over $500. But I think i just need the plastic base. Is it possible to buy just that? How would I figure out a part #? Thanks!