I need a Campy N.R. 144 BCD chainring that is 46, 47, or 48 tooth. I can trade a 144 BCD N.R. 42, 44, or 52 tooth, or a 42 tooth S.R. (144 BCD), or a 151 BCD 55 tooth Record road chainring. All are used but still have many miles left. The S.R. 42 tooth ring is in nearly perfect condition.