A seven speed Shimano cassette/freewheel is a seven speed Shimano cassette/freewheel, whether it was made in 1987 or 2007 (unless it's Dura Ace
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)