Spoked to Death
Join Date: Jul 2004
Location: Boulder, CO
Bikes: Salsa La Cruz w/ Alfine 8, Specialized Fuse Pro 27.5+, Surly 1x1
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You may want to specify what brand, year, and model of derailleur you are talking about. There are only about 10,000 possibilities.
But just to toss out some random maybe-related info, Shimano 7 and 8 speed guide pulleys have no problems with 9 speed chains or drives. Whether or not they are interchangable for replacement purposes is unknown from your post, though I wouldn't count on parts that are 5 years apart having many interchangable parts.