S2 - That info is found in the Chevy Master Parts Books, but not always an easy read and find process. You can find the vast majority of the info related to your Chevy 1955.1 3100 in the following free on-line books:
1929-54 Chevrolet Master Parts and Accessories Catalog1929-57 Chevrolet Master Parts and Accessories CatalogMany specific bits of hardware are listed in the individual major item sections of the book, like engines, transmission, etc., but there is also a combined section of the books called
Standard Parts Listing (this one from the 1957 Book) that provides further specification details for common hardware items that is often not included in the part description in the major component sections of the books.
Take a gander at these and if you need to, come back and ask more questions and we'll try our best to help you out with more info.
