Ok, you don't need to pull the entire supercharger to replace the coupler like Series 1 owners do. You can pull just the nosedrive.
both have kits and couplers available for you depending on what you need. www.zzperformance
also sells the coupler and oil (you'll need 2 bottles for the M90).
You might want to remove the belt and rotate the pulley back and forth. If it'* sloppy, you need a coupler. This is usually indicated by a rattling sound at idle only. Any other noise may indicate low or non-existent oil. Is it leaking? Is it full?
Put "98 SSEi" in your signature with any mods you may have.
will also have an M90 rebuilt nosedrive for you. Not sure if it includes a coupler, but don't buy anything until we troubleshoot the root cause.