I was looking for a driver's side interior door panel and a passenger side rear interior panel (guess I am still looking).

If you haven't tried them already scandcar.com is a Dutch vendor with a good web site with lots of hard to find parts for all older Volvos (including the all important weather stripping and other rubber bits). If you are desperate, I think that I saw new front fenders on their web page if you don't mind the nose-bleed shipping costs! Genuine Classic Parts GCP.se is a swedish vendor who manufactures parts for classic Volvos. Excellent thing about their web page is you can down-load the original Volvo parts manual for the 140 gratis. Makes finding parts easier on the web when you can search by the part number. Also, pictures in parts manual are of use for people like me who are doing a complete body strip and can't remember exactly what went where 2 years later.