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definitely junk yard, (try car-part.com and hollander parts .com [they are aggregators for all the junkyards]) but first try Ebay as most junkyards have the pieces up there anyways and they have better pictures and they are more likely to have jsut the pice you want vs. junk yards that may only sell the door or some larger piece.
As for fittament AFAIK its pressure fit...it should fit on with snaps very odd that it came off like that without any kind of impact or prying...you could probably put some adhesive on there too but it could get messy.