I wish you the best of luck... I replaced mine with the Gruven parts, and while I was reluctant to spend that much for what seems like so little... I have no complaints. They work great. I will never have to replace them again and they were much cheaper than buying replacement mirrors with inferior plastic gears. As a bonus to me, they are made in the USA by a US company so it helps support people here in our country.
If you do have success, post your results on here... I'm sure others would be interested in a cheaper alternative.