Install larger display on 15 inch version

Hi,

I got an 15 inch version of iMac g4, and now I have begun disassemble it and upgrade, so I put more memory, airport express bluetooth.. but was wondering is it possible to install 17 inch display module instead of 15 inch one?

Also does anyone have any advice on how to whiten the iMac? Because it started to turn a bit yellow, instead of white, so was wondering if I can whiten it again and clean it....

Many thanks.