This has been hanging on my wall for the last few years. Great wall art. We're moving our garage to another location, so some things are finding their way for sale. It would be safe to say there aren't many of these around. Here you go... http://www.ferrarichat.com/forum/ferrari-parts-collectibles/447972-ferrari-boxer-bb-bbi-rear-clamshell.html
Sorry to the Euro buyer who couldn't make shipping work out, on ebay now... Ferrari Boxer BBI Rear Clamshell | eBay
I have two 911 front fenders, a 930 tail, and an Etype bonnet dangling around! If the Boxer clamshell works for you, it'll fit in a shortbed stepside truck perfectly, as that's how I moved it originally. Or of course, trucking is not an issue.