Product review (1 stars): Believe the negative reviews
I thought maybe they would have got rid of the batch that caused all the bad reviews.  My kit arrived yesterday, and the cut-off unit didn't look as substantial as the original.  However, I installed both new parts as recommended, and thoroughly cleaned out the dryer, the vent, and the vent hose.  The dryer ran fine on two short empty test runs, so I reassembled it, put in a load of towels, and started it up.  Two hours later I noticed it still running--cold.  Maybe the heater never even fired up with the towels in there.  I pulled it apart again and sure enough the cut-off unit had no continuity.  So now I'll buy some real parts.