I am looking for a 1998 S90 passenger sun visor. Are there any other names that they might be called, so that I can fond one, using the words "sun visor" is not working very well?

Try car-part.com
I looked up the part in Texas and only found Tan.
Try expanding out to other states around you. I used USA and found lots of grey interior panels. Use "interior complete" or "interior panels/misc" as a search term.
When you find a Grey door panel call the yard and see if they have the visor available. I would say 90% of the time they have it but didn't list it.
Good Luck

:00000732:

Let me add there is a guy over on the Brickboard parting out a S90 his son wrecked. You may want to grab some parts off it before he gets rid of it.
It has a grey interior so you may want Email the guy before he sends it off to Goodwill. He is in Austin Tx.
pics http://brickboard.com/RWD/index.htm?id=1192780
His Email colhan01@yahoo.com
Link to original post http://brickboard.com/RWD/index.htm?id=1192690