Help!! 2004 Lexus RX330 AWD Rear Wheel Bearing Hub Assembly

[Cuao]

I need to replace the passenger rear bearing hub assembly on my 2004 Lexus RX 330 AWD. The car makes a loud hum as you increase speed and continues at speed.  There are several manufacturers of the replacement assembly.  Some start at $30 and go all the way up to $150.  In my research I found that NSK brand is OEM.  But here is my question.  NSK offers two assemblies.  One is around $85.  The other one is around $110 but comes with a built in sensor of some sort.  Can anyone tell me which one I need?  Any help will be much appreciated!!

Thank you in advance.

[eugene.s]

Not exactly on your question. But. Go here https://drivers.lexus.com/lexusdrivers, register your car. Probably (but not guaranteed) is that you'll have everything fixed for free.