is it necessary to include aamc# in the lor?????? - letusdoit

[ArchivalUser]

should the lor address the program director ?
and should it include my AAMC#

i am old graduate and i got it before i came to the states from my profs and these are without AAMC # and address " to whom it may concern"
do they work or i have to get new ones

please somebody clarify
thanks in advance