HEATER FAN BLOWER RESISTOR PART NUMBER?

[RS6C5AVANT81]

Hi Guys,
I've already bought a new blower motor for my car - but also i will replace the resistor at same time while I'm doing the job.
I need to get a heater blower resistor for my 2004 Avant - Can some one confirm the part number pls before i order one off Ebay? - as OE not available now. I'm 99% sure its 4B0820521 ?
But lots of places on ebay as saying not compatible when i select my car model ?
Many thanks
James

[RS6C5AVANT81]

To update everyone - i replaced the heater blower fan motor resistor. Problem sorted ! £25 cheap fix!