Product review (5 stars): Great replacement for either the WR17X12133 or itself!!
I bought this product as a replacement for the original GE Part Number WR17X12133 and it is great.  The original WR17X12133 has a thin silver coating that apparently comes off over time if not careful cleaning the tray.  When this happens, it can leave a nasty green color, which is the main reason people buy a replacement for it.  If you don't mind the black color (which actually looks pretty good), I highly recommend this product as a replacement for either itself or the silver WR17X12133.  If you are replacing it for the WR17X12133, I just want to say that this product does appear to stick out about 4 mm more from the tray than the WR17X12133, but the width is an exact fit.  But really, the 4 mm is so minimal that if you don't stare at it or point it out, nobody will know it or care about it.  I was a little reluctant in getting this as a replacement for the WR17X12133, but I'm really glad that I did.  As opposed to the WR17X12133, which costs anywhere from $55-100 (give me a break GE for a piece of plasctic!!), this costs only $12.  In addition, I don't have to worry about the silver coating from peeling / flaking off again and having to shell out another $55-100 to replace it .  I also bet that this cleans a lot better than the WR17X12133.  For $12, you really can't go wrong.