The guibo joint / flex disc / universal joint, part #2 here was the only part I bought.
Tonight I took the driveshaft down, put the new guibo joint on, and bolted the driveshaft back up. Tomorrow I should be hanging the exhaust and bolting everything back up. Also, you do NOT have to drop the transmission mount -- there is a gap where you can hold the necessary bolts at the guibo joint with a 16mm crescent wrench with the transmission mount in place.
White 2007 Alpina B7
Supercharger clutch/bearings (check DIY), sunroof seal, quarterto8's 6000K angel eyes, bumper side mounts
Black 2002 BMW E66 / 745Li (sold)
KW v3's, blue angel eyes, 8000K headlights & HID fogs, rebuilt alternator, sunroof seal, CCVs, NGK Laser Platinum plugs, sway bar bushings, battery, timing & valve cover gaskets, valve stem seals, guibo joint, mechatronic sealing sleeve, trans fluid, alternator bracket mounting gasket, sanded headlights...