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I think this might be an older moulding. You might try Joe at Mesa picture framing in Costa Mesa. He purchased a whole warehouse of oddball moulding from them. He is a very nice guy and if he has it I am sure he will be more then willing to help you.
I don't believe this is an old number. The stock is supposed to be replenished by the end of May at LaMarche. I just need the moulding for an order I have due next week.