Try A & F out of California. I my V8 harness retailed for 600, I paid less through my shop, but i would imagine that the simpler harness on the L6 is cheaper. give Hurbert a call at 1800 748 6330 Ext.110
PS, I have an intake air temp sensor i bought for my moms car but no longer need it, NIB first $10 takes it. Will work on m104 motors. part number 010 542 57 17. Dealer list at twice this price.