When you reassemble, read up on the torque specs for those bolts. Both my SL and SDL had torque specs of 10nm which I'd classify as "snug". Unless the bolts were rusty hulks, there's no possible way to shear them off at 10nm.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)