53 to 56 fuel pump

140 exchange.  mid 55 to 56 is slightly different than 53 to mid 55.  when you send yours in for a core exchange, please keep your removable fuel line fittings and make sure that you do not send a pump with an aftermarket cheap sheet metal arm.  those pumps do not have straight across core exchange value.  if you have any questions, do not hesitate to call us.