Weld the pan. A good welder should be able right where it sits AS Long as it is not into the threads of the drain plug.It should be a easy job. If it is into the threads Your Going to need a GOOD Tap Not a L cheap O. Hope this helps.
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PS.If you can get it off and for what ever REason you can't find anyone to Fit it Send It to me I'll Fix. Send me a Pic if you can Of the Cracked area..Even If it is Into the threads It can Be FIXED