If we are talking about the rubber bungee that holds up the floor, my 4.8is has it. It does not however have the suspension netting type setup that helped to lift the spare tire out of the well like my old 4.4i did.

Now, neither of mine came equipped with the roller floor so I can't speak to what setup that one is supposed to have. I'm supposing the prop rod situation mentioned on the previous page.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)