We've owned and operated the largest mobile power window repair business since the year 2000.
We have installed and rebuilt thousands of power window regulators for my business and for a large, local distributor.
Since we install, we know the precise specifications of each vehicle.  Excellent rebuilding is a direct result of knowledge obtained in the field.
Original Equipment Parts that came with your vehicle are being inferiorly copied and sold as "NEW".  These after market knock offs are of poor quality as they are manufactured with inferior metals.
When they first were introduced, companies would send me these parts in the hope that we would order from them. 
When you visually compare an OEM part to this "NEW KNOCK OFF" you can see that it will fail, it is obvious.
The smart alternative is to rebuild your original part, there is no substitute for the manufacturer's regulator.

We have also serviced the DEA, IRS AND ICE  fleets in Fort Lauderdale