Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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It sounds like the entire "crank" was replaced, not just the chainrings. The crank manufacturer will determine the proper BB length. Get whatever BB you're supposed to. I'm surprised the LBS wouldn't have suggested selling you this extra item.