The parts I have I purchased from E-bay. I have an Auto-lite distributor I do not see any part number on it. The cap I have has IG-57 stamped on it, I believe it may interchange to IG-1057. The rotor is round and the package it came in has part number AL13 hand written on the bag. I do not have a part number for the points but the total length is about 1.75 inches. I did go to NAPA the part suggested by Brian was shorter than mine. These points seem to be the same as what would be in my 26 Flint however the Flint is also missing the points.

Do You own a car built by Durant? 1925 Star