Hmm, you might be able to fix that with the same program, Iconedit. Load the icon, select whichever colour is transparent (looks like the shadow the Jaz drive casts), then fill the whitish areas with it. Alternatively you could load the original pictures into a paint package and do the same. From there you could even flip them around so they face the same way as your other icons (of course they would look mirrored though) then save them again as icons from Iconedit.
Cheers