You can usually get a small set of these at autozone (or wherever):

http://www.irwin.com/irwin/consumer/jhtml/browse.jhtml?catId=IrwinCat100511

Put the size you need on a breaker bar, and unless it's welded into the pan, you'll get it out.

And yes, there are kits to repair oil pan threads should everything strip out.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.