This is not your case BUT for anyone else where the clutch pulley that is chirping then I would replace just that. I have never been able to get the part number of the clutch pulley for the G8 GT alternator but an alternator repair shop should be able to get one. Clutch pulleys are expensive when compared to regular non-clutch pulleys. They are about $50 to $60 plus labor done by the alternator shop it will be about $90. I have replaced my alternator by getting the AC Delco unit for about 179$. And then kept the old unit around as a spare and will replace it's clutch pulley with a regular one. If money is tight the non-clutch pulley is way cheaper to get (about $10) and usable. There may be some new alternators floating around where they want to get rid of them for a lower price but nothing lower than 150$.
If anyone is interested in replacing the alternator clutch pulley only, I have the part number saved from prior searches. Its CLUTCH PULLEY A3TG1581, A3TB1691, A3TB1691ZC, 11097,13955, 28775, A252C5321C, A252C532BC, 24-83302-4, 6025. Available on ebay here https://www.ebay.com/itm/CLUTCH-PULL...5/321044962677
Class SD6, 6-Groove Clutch Pulley.
Thread: M17 x 1.5, Diameter: 58.75 DOB 17mm Hex, 38mm WideThere are a lot of other interchange part numbers, I will list them below.
Class SD6, 6-Groove Clutch Pulley
Thread: M17 x 1.5, Diameter: 58.75 DOB 17mm Hex, 38mm Wide
WAI New 24-83302-4
Arrowhead 920782, AMT5026
Autopulley Europe AL-920782
Cosmos International 32-73709
Facet Purolator 9-8301
IKA 3 5448 1
J & N 206-48005
Just Parts MT1-5099-6
Mitsubishi A252C5321C, A252C532BC
OEM UNIT NUMBERS
Mitsubishi A003TG1581, A003TB1691, A003TB1691ZC
Mitsubishi Sales A3TG1581, A3TB1691, A3TB1691ZC
Lester 11097, 13955