Bike model..?
Western Cycle Salvage will probably have it.
Also, you can try t contact Paulages from here on the forum. He has a ton of stuff also. Dunno if he has what you need though.
Ryan (R550 here on the boards) had his pan crack. The PO had tightened the oil drain plug so much, that a small crack had appeared there. When Ryan tried to put the drain plug back in, half the section with threads just fell off.