This may be better suited for the classifieds...
I don't have a part number. However, I do have the black armrest pad if you were interested and can lead you to an EXCELLENT fix-it to a common problem. It's common for the bottom of the armrest to break as elbows lean against the front of the pad, the underside is plastic and frequently breaks...it's just plastic. I see lots of trucks for sale with the armrest leaning towards the cup holders or the armrest missing period.
Go to RockAuto.com and search part # ARM100. That's the fix-it forget-it fix for the common armrest breakage. If your truck still has the hinge, AWESOME!
I see on eBay, there are plenty of new or used black armrest pads and hinges for around $100. If you're missing the hinge, this may be a good option.
Example: 2001 2002 2003 Ranger Genuine Ford Center Console Lid Arm Rest w Top Pad | eBay
If your truck currently has the hinge, you would only need the armrest pad and the base plate. If you were interested in a lightly used black armrest pad, shoot me a Private Message.
Note: Your Ranger full length console with subwoofer armrest is exactly the same as 98-12 Ranger "shorty" consoles as well as many Explorer "shorty" consoles. '03 is when they started to be Black in color....previous years they were Grey or Tan. Pictured below...