I can't think of a way your 3.2 could have enouth torque to have broken the shafts unless the cv joints possibly broke and locked from being without lube for a long time. Was it making noise which you ignored? Are the rubber boots torn up. Perhaps if you had a more detailed discription of exactly what part broke and where. OR photos would be even better.... the axle shafts are available but I don't think many are sold since they are usually very long lived IF the boots do not leak out the grease. Check with Phillip here at FastLane parts once you know what exact parts you require. Salvage yard parts might be used IF the wreck did not contact that area and the parts have good boots and are not bent from collisions.

Really good maintence is the key to a long life for your MB.

DanielW