Product review (5 stars): The Washer is fixed!!
While I'm disappointed that I HAD to buy this part to fix my washer, I'm glad that that the part that arrived, fit well and fixed the problem.  This part was ordered for a LG front loading washer, model #WM0642HW  because the drum would not rotate. Apparently the splines on the inside of the hub of the rotor wear off, and allow the rotor to slip on the tub shaft causing a growling sound. Removal and replacement of this, was one of the easier jobs I've done.  There is a You tube video for this replacement. Search for  " Rotor (part #AHL72914402) - LG Washer Repair" even though the part number is different, the process is the same.
I have to admit that the washer has less vibration now on the spin cycles!!
Lesson learned about the shipping information provided by the USPS. The website that the "shipping information" leads you to, isn't always accurate.  My experience was that the USPS web site said "part arrived for shipment" at the seller's end, but had not been shipped. Even on the day it arrived at my house, the shipment information on the USPS site, was not up to date and still showed in transit, or words to that affect. To credit the seller, the part arrived quickly and well protected.