There's a TRF 415 thread on this forum
Anyway, if your running diffs both front and rear, they are a direct replacement to the old pulleys. Also, you will need to set the belt tension as low as possible, as the belt as less slack due to the larger pulley. Because the pulleys are one tooth larger, the internal ratio of the car goes from 2.1875 to 2.25.
If you plan to run a oneway, and get the oneway pulley for the front, you will need to shave the material off the pulley to get it to fit.
For the spool it is also a direct replacement.