Product review (5 stars): works great, easy to swap.
I could only order the entire assembly from Sears and a local appliance parts shop.  Both wanted over $150.  It's crazy since the pump is usually the culprit, not the rest of the housing.  It arrived within 4 working days.  Just a few screws and a wire clip after I removed the kick plate.  We've had it in for ~6 weeks and have washed >50-60 loads.  Not a hiccup.  I highly recommend.