The rubber mounts are symmetrical, the mount arms are not, as you can see. Both rubber mounts are oriented symmetrically with the small bolts forming a 25 or so degree angle with the cross member (bolt closest to the center of the car towards the rear of the car. The small bolts are usually accessible with a L shaped Allen wrench.

Let me know if you want a hand. I've got a portable wire feed welder too.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine