alternator pulley

i installed an unorthodox underdrive crankshaft pulley on my 2.4 96' convertable ls cav. I need to get a larger pulley for the alternator but am trying to avoid the $75 they're asking for one. anyone know of any compatable pulleys off of any other components or cars that would be about the correct size i need to bring my amps the alternator produces back to where it belongs if not more?

just go get the AEM pulley...