1980 300D Starter help needed

My starter recently quit. In an attempt to save cash i am going to do this myself. However, i do not have the correct size allen wrench to fit the 2 bracket bolts. Before i go to Sears to buy a half dozen wrenches - does anyone know the correct size. Also Haynes manual is not clear on exact removal - looks like i bring it out under the air filter housing is this corrrect? Any tips will be greatly appreciated. Many thanks in advance
Josh f

[Benzmac]

It will easily come out the bottom with the steering wheel turned the right way. The bolts are 10mm allen. They will be reallllly tight. I'd pay the $100 and have someone with a lift do it, but if not, just take your time and don't, what ever you do, don't strip or round the allen bolts.

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Benzmac:
1981 280GE SWB
1987 16V
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