Replacement Side Mirror Cover

My passenger side mirror broke recently and I ordered a third party replacement for $40. It went in fine, about 10 minutes of work, but then I had a problem. The old cover that snaps on wouldn't snap on the new mirror. I thought my tabs were slightly misaligned, so I bent them a touch

and snapped them.

Now I don't have a cover that works for the mirror. I haven't found them for sale anywhere. Has anyone found a place that can get mirror covers except from the dealer? I hate to order a $70 one from them when the mirror assembly was $40.