Upgrading old caliper brakes is a way of increasing your braking performance, going from a single pivot design to dual pivot. However, most modern brakes are designed with a recessed allen key fitting for modern frames, and do not fit into older frames. These brakes are the best available with a nutted fitment, and are available in 2 different drops, depending on application.
R359 is the shorter verison, brake drop is from 47-57mm drop.
R369 is longer, dropping range of 55-73mm.