I'm wanting to change out the speedy modelo brakes on my old (1986) cannondale touring bike. According to a bike guru I know, newish brakes won't work in my frame and fork due to the style of mounting.
Speedys are a basic side pull single pivot brake , tektro offers all sorts of dual pivot side pulls .
bring the bike by your local bike shop and they will help you select the right brake.
or pick up a set of Kool stop , brake pads , if you spend a bit more
you can get replaceable insert shoes
though the Kool Stop Continental is a good brake shoe, molded in one piece.