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Look on the lense........what is the name and/or number on there? I should be able to tell you from that. Attach a photo of one to your post as that would help as well.
Give Northwest RV Supply a call at(###) ###-####in Eugene, Or as they puchased all the stock of Monaco when they went out of busniess. If they don't have it or can't tell you where to find one let me know. There are some good used RV parts places I can recommend.
Were they able to help you on this or do we need to look at some used sources? If so, try Colaws and I am attaching that link for you. http://colawrvsalvage.com/