If your Craftsman takes bushings at all, I suspect they will take the Porter Cable ones. A quick way to tell is if the through bore in the base plate has a counterbore slightly larger on the bottom, 1-3/16" and 1-3/8" respectively. If it doesn't, the Milescraft set is the way to go. The Milescraft set includes a baseplate that will center up on the Craftsman just fine (good instructions included, for a change). A big advantage to the Milescraft system is when you remove the bushing, it leaves a hole large enough to take a good sized bit. A baseplate made for the Porter Cable bushings just leaves a 1-3/16" hole which is just to small for a 1/4" roundover and larger bits. The system is likely cheaper than a replacement base plate plus a set of bushings and saves the hassle of making a base plate (although they aren't all that difficult):smile:
As far as long and short barrels in the Harbor Freight set, they aren't all the same. ie, the 3/4" bushing will have a barrel in the neighborhood of 9/16" which means you will need 5/8" minimum template material (unless you hack off the barrel) which is a significant amount of depth of cut. The biggest plus to the Harbor Freight set (IMHO) is it includes a 1" bushing which I have found to be extremely handy.
I have yet to figure out what to do with the 51/64" bushing most places include with their sets. It is very close to 20mm so if you do stuff in metric I suppose it would be useful.