Well when I'm asked I say... go to my links page at http://www.zeffie.com/links.html and click on the go button which will take you to where you can choose the model and then purchace form there....
A better link for that site is: http://www.crucial.com/store/listmodel.asp?cat=&mfr=Sun&productline=Cobalt+Products&submit=Go This will add the RaQ 550 and RaQ XTR to the list of available RAM upgrades.