Miguel,
I only have one spare airbox and screen and I intend to use them on a junk Grande I'm restoring. I have a friend who has extra screens, however, if we can find you an airbox. You might consider rigging up something in the meantime. I wonder if some air filter material that is made for lawn mowers (the foam kind) could be rigged up as a temporary fix? I have some parts coming in this week, and there may be an extra there, so check with me later in the week. I believe I have a spare centerstand. I need to check through my stuff. If I do, are you interested in it?
Chris