68 340 with factory air lower crank pulley #

Yes that is the lower crank pulley that I am looking for. If you look closer to the top of this thread Jim (RealWing) sent me pictures of his original 340 with air and power steering lower crank pulley and it looks just like your's. The part number is 2536752 but the problem is that the part number is not on the pulley (good job engineers)
Thanks for the pictures.
Bob