My post was intended as a data point / informational. I got my replacement 151 ring by lurking on the CR list, and found a seller. Sometimes Serotta forums can provide vintage stuff also. Just some other options to consider, but you have to be lucky.
Edit: the old ring I have may be a 46t (sugino?). If someone is really interested I will check tonight
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"
Last edited by norskagent; 04-21-09 at 08:06 AM.