Can anyone tell me what sources there are to buy CD changer mechanisms?

I have a head unit with a 6 disk changer that needs repair. I have researched this and found a few shops that will fix the unit. Those shops remove the CD mechanism and replace it with a new one, that's all. They get the mechanism from someone else.

I am a DIY kind of guy and want to replace the mechanism myself, I can remove the mechanism but I don't know where to buy the replacement. There are no separate part numbers or markings on the CD mechanism.

It's a stock 04 Ford Mustang GT Mach 460 system, head unit part number is 3R3T-18C815-TE. Yes I know I should put in an aftermarket but I like the stock version, I have 2.

Thanks

 

I'm having problems with my system.. Says CD error and will not play. Any suggestions?