If it was just the clutch, you could possibly buy that seperate from the compressor. Also, if the pulley is seizing, you had better buy a belt now. That way you can throw it on whenever your current one breaks or you get the problem fixed (no doubt the current one has taken some where and tear from it).
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne