Monster doesn't make component cables for the GC.
Anyway, supporting those high resolutions would cause a major drop in framerate, so it's really not that bad that the current crop of games don't support anything higher than progressive scan. I have a 53" panasonic HDTV and I've never had any complaints with graphics. All Nintendo-published games support progressive scan (and, if you're using the component cables, it automatically defaults to prog scan so you don't need to hold any buttons or anything when the game boots up).