Product review (5 stars): It works as designed in my 9-year-old Whirlpool GT4175SPS microwave ...
It works as designed in my 9-year-old Whirlpool GT4175SPS microwave.  Not sure how long this will last as many have reported issues with this latch after a while.  However, as far as this replacement goes, it works perfectly.  I purchased mine from Amazon.