[Roadsters] brake part interchangeability question

[chalsted at comcast.net]

I have caliper kits, rear wheel cylinders, pads, shoes for my 69 2000 but have to change car's I'm trying to get ready to go to the Glen...can I use these on a 66 1600 or are the threads different? I don't remember where the change came in between standard and metric and when the size of the caliper pistons changed...guy who was supposed to be getting the body ready for paint on the 2000 came over a couple weeks ago and cut the LR quarter out and then never came back....gotta have a driver for the Glen! nothing like starting with a car that hasn't been run in around 15 years, needs paint, no interior, needs tires and wheels, brakes and chrome....2 weeks before we're supposed to be leaving for the event 8-) 
Thanks, 
Craig