Thats what made me think that jack was not for the 8, the 8 jack dosent have a groove it actually protrudes out and sits inside the cup on the underside of the car, the part that is gray and looks like a groove is the magnet.
You can get bags that fill from the exhaust, they were used a lot by off roaders for recovery and on soft ground where you would just jack a jack into the ground. I thought about putting one in the boot of the 8 but wasn't sure how soft the underside of the cars is.
