1996 Miata keyless remote programming

I am trying to reprogram the keyless entry system for my girlfriends '96 Miata (2 remotes). She went to the dealer for some other maintenance issues and asked about it. They wanted to charge her $75!!! Are these instructions really that specific depending on model and year, or are most Mazda instructions the same? Any help would really be apprciated. So if anyone has instructions please post or PM me. Thanks.