I have a part number on my old insert - will that help? In this assignment, you will add a little drop. Items 1 - 60 of 7222 - Clock Repair & Replacement Parts - Four-Hundred Day Clock Parts. Dr. Emmett Brown and Marty McFly's photograph of the clock - Part 3 of Jason Scherer's Innovative New ULTRA4 Car. Last edited by a moderator: Dec 3, 2009.