it's raining here, so I won't go out and look at my car, but if there is enough room, a small pipe (stillson) wrench should do the trick.....I have a 6" one for removing the odd stud and rounded off bolts and such.....

also, as was mentioned those Craftsman Bolt Extractors, I think I have seen them sold in Lowe's (Irwin Tools)....work well......

always use lotsa penetrant.....and some heat, if possible to do.... and not create a hazard or local news item.....

heat, penetrant, cool, tap tap....repeat several times....try again......patience, some beer or whatever may be in order to prevent frustration....

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG