BugMod.com had a great How-To (I used it myself) but they are offline now. I suggested that we should place a copy here on the .org: http://www.newbeetle.org/forums/showthread.php?t=530
and marvins_dad said he would post it sometime. Maybe you could PM him and remind him.
Otherwise I have a copy that I could send you, but I think it would be much better if the material was posted here on the org.
Anyway, I think its a great mod that would defenitely fit your car. I bought my -03 mirrors from ebay.de for 189 euros. Occasionaly you can be lucky and get them cheaper.