It's because Amazon's system is setup so that each product has a single SKU, and they don't care who makes the product that has the SKU. So, there could be 10 companies that make the part, and they are all assigned the same SKU. When you order the part, they guy in the warehouse (or robot) picks from a big basket that includes everything with that SKU, so you can get something that varies tremendously in place of origin --> quality.
Also, alerting Timkin may not even have a positive effect. I pointed out through a detailed email with pictures and all sorts of info, that they were assigning the same part number for the 2004 TA60 (Pathfinder) Armada and 2004 R50 Pathfinder front hub assemblies.
The Pathfinder uses individual spindles/bearings, while the Armada uses a one-piece hub assembly. They never got back to me, and continue to incorrectly label their parts.