From what I can find the numbers come back to a 58, 392 hemi, should fit poly and LA small blocks as well. Numbers are: Chrysler 1841515, Auto lite IBS4007A a small "11" crossways to the "4007A then an *M". Do your own research to verify fit. Spins free, no play/slop apparent. $100. Shipping on buyer, prefer postal MO. Or cash.