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I thought that was a common part.
Since it's a PC I want to keep it as original as possible. If I can't buy a right side with no lever then I'll just leave it alone. I thought that was a common part. With the ambi safety the two sides connect inside the frame and help hold things together.
1911 single-sided safeties are a very common part. Look to Brownells for many options; you'll find at least one that will look correct on your model.