paint code for petty blue

anyone know the paint code for petty blue? I was at the paint store yesterday and they were trying to tell me it was b3 but that does not sound right. I am going to be repainting the dart this winter and want to do it in petty blue.
Also has anyone used the tcpglobal.com paint. I think they call it autobody restoration paint? Considering that or PPG shopline or PPG Omni Paint. any suggestions or comments ont he paint choices would be appreciated.
Thanks