Working on my 1950 Chevy 3100 and would like to know where I can find a discription of the bolt factory numbers. I have three bolt numbers that I would like to know the length of. From the factory assembly manual the bolt numbers are: 122017, 122007 and 120229. Does anyone have a "conversion"or "discription" sheet for Chevy bolts from 1947 to 1st series 1955?