This recall affects all mk1 puntos.
The letters get re-issued so that none are missed, might be outstanding or might have been done.
The rigid pipes have to be checked and either replaced or have a coating of paint put on them - have done so many of these its not funny.
The recall was issued in '01, but the letters are issued in stages of chassis numbers - just think of all the mk1 puntos there are/were. Fiat also started with just chassis numbers upto p reg - then all others upto last vehicle, now they are starting from beginning again to find any ones missed previously.