'98 A/C Clutch Needed

My A/C clutch is screeming like a baby and needs to be replaced. The compressor works fine and recently charged and blows cold but the 'screeeeeeeching' is awful.

Where can I get the clutch setup besides the dealer?
Thanks.

Any junkyard, or try www.daveysjeeps.com

Note from DJ
This information from
http://www.sanden.com/originals/images/SD_Service_Guide_Rev.2.pdf
7.2.2 Air Gap Check
1. Air gaps exceeding 0.051” (1.3 mm) can prevent engagement. This often is noticed after the clutch and compressor temperature is heated through normal use. Refer to section 8.2.6 for more information setting correct gap.

2. If the overall gap is out of spec., remove the armature assembly and change the shims as necessary.