'97 Corolla: How Do I Replace the Side Mirror Glass?

#1
I just want to replace the glass itself and not the whole mirror/housing; internet results only get me the latter. And any advice on where to buy? It's $6 on Amazon and I'm not sure if it's too cheap. Are there any alternatives you would suggest? The scratches on it are causing glare and it's driving me crazy. Thanks.
 
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