Usually you lift a car on pinch welds in the back if the car has them. But if it doesnt have them then you put the pad on a body structural piece such as a support beam

Before lifting any higher make sure its safe by pushing the cars trunk, it shouldnt move much.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)