This problem is getting worse all the time, even with the suppliers that generally get the blessings of DIY'ers like those here on this sight. You have to point-blank ask the supplier if it's original equipment, and even then you need to listen carefully to their sometimes misleading answer.

"OEM quality" to me means some knock-off that the seller would like to think is good enough to make you happy.

"OEM" (Original Equipment Manufacturer) might mean it's a bonafide Volvo part, or it might not. It might just be a cheap version that happens to be built by some European company that bears some distant relationship to the REAL manufacturer of the REAL Volvo part.

"Volvo" part - That could mean anything....

You'll hear the term "blue box Volvo part", which is probably a good handy phrase to use. Asking for that and also asking if it is labeled with a real Volvo part number and Volvo logo on the packaging is about all you can do. We all know the dealers get a pretty price for the real stuff, but if some other supplier claims to be selling the real deal at a price that is less than about 2/3 dealer price, you really need to question it.