Oil Sensor & Front wings

I have a A4 2.0L petrol 2001 (first of the B6). I need a new oil sensor as it stopped working not long after last oil change. Can you recommend an online retailer for replacement part.
Also, both front wings are hanging with rust and I would like to replace to tidy the look of the car up. I'm not bothered if they are a diff colour, just need to be a good price with no rust.
The last question is concerning front passenger window. Stopped working last week. Any suggestions?

Thanks in advance.

1.Euro parts for oil sensor
2.Ebay for the front wings
3.Your motor has gone or the regulator has gone

Cheers for reply. Think the window can wait for now. I'll crack on with the other jobs.

Just checked, pretty good prices for wings on eBay bro