If it makes you feel any better, it's not uncommon to run into selector plate problems when putting a different brand mechbox shell into a given receiver.
Sometimes it's the selector plate, sometimes it's the mechbox shell.
What you can do is pull the old plate off your old shell, remove the safety lever, trigger and cutoff lever, then the plate will slide out. Make sure you don't lose that spring, you can remove it with tweezers first.
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