I thought mine was just the tool that came with the car.... not TOO ' fancy'.....
It fits the engine drain, the trans fill and drain, and the fill and drain on the differential.... and I assume, although I have not gotten to it yet... that the bend is for reacing the trans plug....
and why have I not gotten to the trans plugs since I already have the redline to switch it out ? Things like in this picture keep getting in my way....

Hey, I saw those berries last year!

The plugs on my diff came out with the AutoZone tool, a breaker bar, and a 6 foot aircraft aluminum pipe. That's just about the handiest tool ever.

Greg,

Very nice looking berries. I can understand how, with something like that in your way, getting that transmission fluid changed is being put on the rear burner.

I have done this with a 14mm Allen wrench I bought from Snap-On in about 1975. As I remember it was more expensive than any MB part I had purchased yet, so I still have it.

I typically use a mallet and the wrench, and tap firmly and repeatedly to loosen the plugs and drive them about half a turn before I can turn them the rest of the way by hand. I assumed the factory guy overtightened them the first time, and was careful not to pound them back in. But it makes no difference. I think one is a pipe plug and the other has an aluminum seal ring (meaning the drain and fill plugs). Both are not really good designs for ensuring they will come out easy. But, maybe that was the intent, to make them stay put even if they are not put in to a precise torque.

Like I said, I have done this literally dozens of times and not had any problems using a mallet to convince the plug to come out. Jim

Jim, I tried the six pound sledge first....but it was not budging...anyway... this could give people ideas about other items in their life needing a little extra power....