SR20DET pulleys

I got some SR20DET light weight pulleys in and tried them out on my KA24DE and the only one that really fit was the fan pulley. I assume the alternator pulley may work, but I have a custom performance 210 amp alternator and didn't want to change it's pulley.

The large pulley has a different setup on the inside where the teeth are, but goes on. It is lose but can be bolted down. I do not trust it. So I guess I will send the set back.