I just a few months ago installed a RetroSound speaker in my LX450 because the passenger OEM speaker was shot - no cutting required, you can retain the factory speaker grills - follow Crutchfield's instructions EXACTLY, or you will damage the door interior trim (the black 'garnish', specifically)
speaker works fine, cost was totally acceptable, and Crutchfield instructions were key to success
incidentally, Crutchfield specifies the same RetroSound speakers for a Miata, so I had already installed them a few years ago in my little

car when those speakers crumbled