I just bought a 19t, 1/8" eai cog (not deluxe) at the clean machine in carrboro, n.c. this past weekend - they had several other sizes in stock also. Kind of pricey @ $39 + tax.
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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"