How big are the bolts? Craftsman has these things you place on the bolt head (it will grip the bolt no matter how badly rounded off) and they are hexagonal on the outside so you can use a socket wrench or combo wrench or whatever and turn the bolt. Works great. I forget what they're called though.

Edit: They're called Bolt Outs. Think they're 20 bucks for a pack of 5 different sizes or so.

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1985 CA 300D Turbo , 213K mi