N.O.S. Buick parts. I have purchased Buick parts at an auction of a buick dealer that has been in existence since 1912. They didn't throw anything away! The most parts are in unopened Buick boxes. I have been told that the first number is Group No., second number is Part No. Here goes: 4.164 1335188 (1 spring), 4.169 1391677 (2 of these), 4.162 1335187 (1 gear), 4.403 can't read no. (shaft), 4.224 1388752, 4.126 1346942 (1 carrier), 4.169 1392463, 4.162 1170364. I can open boxes and send digital pictures to anyone interested in purchasing parts. Thanks for looking!