As a start, get the part number from the 69 AIM, then go to AMK Products website and click on the pdf catalog button on the left side. The very last section at the bottom of the chapters list has a cross ref for some of the fasteners, see if yours is listed under GM section, then go to that page of the pdf catalog for a description and pic. There is also a section somewhere in the catalog that describes the codes for the different finishes. Many of the parts houses get their fasteners from AMK. Others may comment here, to include opinion on AMK correctness, but always best to begin searching on your own. You can also try advanced searches here, up near the top of the page, using a few key words.