Need a favor from those with SBM and power steering.

Belt is not bottoming. Sits pretty flush with the top of the pulleys. Also the bottom of the pulley is dull and oxidized. Belt is tight. I have even over tightened to check effect. No difference. Looking for pulley. Why are GM $30 and Mopar $80???? Appears to be 6.8" . GM is 5.8"