Wow, that's a bewildering group of carpets in that kit!
Lee, I was thinking your mystery item #4 *may* fit just behind the A/C unit (#8 on the factory sketch), since that wasn't accounted for. (It would make more sense if it were rotated 90 degrees clockwise in the photo). As for mysteries #9 and #14, they must be for under the glass as M!ke mentioned, but maybe cut to accommodate a custom induction system??
While no original interior carpets remain on 8MA1010, the (jet black) rear set may have miraculously survived - looks possible at least. But that said, there are several more pieces than the factory drawing shows. Most of these extra pieces are very small (see first attached photo), but they don't obviously match pieces from the Ebay set.
So ~15 years after taking them off 1010, I'm now bewildered by my own set of carpet bits