Thanks to Scooby105 who had both GameCube items I was looking for.
http://store.nintendo.com/webapp/wcs...rderTotal=null
If that URL doesn't work, go to store.nintendo.com and you can find Hi-Speed port covers. Sadly though, it doesn't look like they have them in platinum, but... if you get too desperate, that's an option.
Egbert, I miss you...