Toshiba DVD-Rom Drive wont open

I have a Toshiba DVD-Rom Drive SD-M1502 that won't open. I have been able to get into the DVD Drive to find that the gear that drives the tray open and close is broken. Just looking for a replacement gear. Hate to scrap the Drive just because of that small gear.

Hoping that someone can lead me in the direction of where to find one. Thanks