[mssl72]

So yeah, the 3765397 pulleys are used on the '66 cars, maybe '65 as well. I believe that number is for the pulley itself, not including the spindle/mount the pulley is mounted on. The bracket is another sub-assembly. The one all the way to the right and the 2nd from the left have the spindle/mount found on the L72 full size cars and the L78 Chevelle/Malibu. None of the brackets look familiar to me.