Product review (5 stars): but I was happy to avoid having to pay over $100 for a ...
I spent about an hour installing these, only because I thought through the entire process and had to break the tabs at the bottom of the OEM retainer cup.  The tabs are not needed, as the cup is held in place by plastic keys.  I bought 3 sets of these dogs, thinking that I would have to replace them after a couple years of service.  We will see how long they last me, but I was happy to avoid having to pay over $100 for a service call and $20 for parts.  Compared to that, $4.00 and an hour of my time is a bargain!