What Thomas said ...
the only R&R specific part in the 14 trigger group is the trigger/sear itself.
There is a wider tip on the sear that interfaces with the go faster parts in the receiver leg.
NEW Beretta/Breda Italian GI Garand triggers and hammers ARE available from Italy, with no hassle from US or canuckistan customs, and the Italian stuff works just luverly, so there is no point attempting to import US GI M14 hammer/trigger bits from the US. Most such parts available on today's US market are either worn out, "reproductions", or totally insanely overpriced.
Although, back in the goodoldays, ALL the FA bits were easily available, and cheap .... BTDT.
[;{)
PS: Some time I'll tell you a funny story about Canadian Customs and M-14 parts ...
Ha Ha Ha!!
LAZ 1