I think I'm going to go with this spot caliper. I don't see how the other spot caliper would work to lock down the brake cable. This one at least makes sense on how to install it. I'm going to go with a 1/4" bracket in aluminum that just uses two of the circle holes. This is just for the parking brake. It is 3.3 lbs with pads, but it has the lock down arm which I would have had to make something or figure out how to mount the heavy stock bracket. Going with this one ends up being probably combined in the same ball park as the stock setup, but it is by far a better setup then using a Wilwood parking brake combination caliper which might not even fit.
This is the other spot caliper that I was going to go with. It is lighter (1.7lbs), but again there is no way to lock the brake cable in place and it is really unclear what kind of mount I would need to make. The trouble of making the additional component to lock the cable down is not encouraging. There were also some reviews about the Wilwood spot caliper not working well.