I would not hold your breath in hopes of finding a shimano forkcrown. shimano does not like to keep spares around for long, not that anyone else does these days. the Ritchey is your best bet. IMHO
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk