Replace a 2005 Buick drivers side mirror

I have a 2005 Buick Park Avenue Ultra SE. It is heated with turn signal and self dimming. It is the DE7 option which is a self dimming mirror. The mirror is clouding up because there is a jell in the mirror and it must have cracked somewhere. I would like to just replace the glass only, because the car has a 3 part paint, white, pearl and clear coat. To find the exact mirror assembly, it is next to impossible. I have tracked down a used replacement mirror and would like to know how to remove the old mirror glass and install the new one. GM wants $450 just for the mirror glass and $1200 for the whole assembly unpainted. UGH!!!! Can anyone help?
Thanks
Bill

I own a 1999 BPAU with auto dimming heated side mirrors. Last year, the driver's mirror did exactly as yours with almost a burnt spot at the 1 o'clock position. After inquires and research, I purchased an aftermarket auto dimming mirror to the exact specs-shape-size that taped over the existing broken mirror.

It is easy to apply as is cut precisely so as to mount right up to the existing molding. I was hesitant to purchase such a small piece of mirror for $30 from a company in California but it has worked out well.

Thanaks, Can you give me the name of the company?

I purchased an aftermarket auto dimming mirror to the exact specs-shape-size that taped over the existing broken mirror.

Seriously doubt that is auto dimming....it's a mirror....

I purchased an aftermarket auto dimming mirror to the exact specs-shape-size that taped over the existing broken mirror.

Seriously doubt that is auto dimming....it's a mirror....

Am I suppose to care what you doubt. I offered the OP some info.

If you read the description in the given link, Tech II is right. In the note, the company states that the autodiming feature is eliminated.

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Thanks for your help. I have placed an order for a mirror glass through the link I was given. I can live without the auto dimming. Hard to find and expensive. I am going back to my 1951 Ford.

Thanks again to everyone.
bijove