Product review (4 stars): Exact replacement.
I bought this as an exact replacement for the one I had.  It's two pieces which is handy because I only had to replace the screen portion.  Here are a couple of problems with this - both with the cage portion:  the spaces.  I've always been told a mouse can get through a space no bigger than 1/2 inch.  The openings at the top corners and the sides are considerably larger than that (and I had some mice in my basement).  I have some white FlexTape that I cut into strips and applied to it to reduce the size of the openings.  Also, the old one is very brittle and barely touching it broke sections out of it.  It was several years old, but I would expect it to be sturdier.  I guess the sun and cold caused it to break easily.  The inner louvered part is still in perfect shape so it didn't need to be replaced.  Too bad the screen wasn't as good.