300SD: starter bolt size?

I have a 1985 300 SD, the starter is hung/seized up. There are two hex head bolts on the rear of the starter that have to come out. I could find only metric allen drivers to 10 MM (a set) at Autozone and
Sears, but it's bigger than that. It seems to be 3/8 in. more or less, but I am pretty sure all bolts are metric size. Does anyone know exactly what size allen driver is needed? As it is, I would just have to get a set of drivers somewhat larger than 10mm, if I could even find a set of larger sizes. I think I know of a specialty tool store that would have exactly the right individual metric driver, If I knew which I needed. Thanks!
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10 mm is just very slightly BIGGER than 3/8"
3/8" is actually 9.525 mm
Are you sure the 10mm won't do it?
According to this website which is the first I googled, the proper tool is an "HZ 2775 HAZET special swivel socket, 1/2" drive 10mm hex bit. For mounting and dismounting the starter."
However, I don't know if this applies to 300SD starters or not.
Paul
JimiGunne wrote:

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Forgot the link!...
Here it is.
http://www.samstagsales.com/mercedes.htm
Paul Valois wrote:

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Some Sears have bigger one... check them online to see whixh one has it. Otherwise, online is the easiest source to get them.
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