Have a look on your parts list, an Excel spreadsheet that lists all the parts, what drawing sheet they are on, and the material they are made from, should be in the front of your preview plans/instruction book
I have recently restarted my 7A project and although I am pretty comfortable with what most of the stuff is I do occasionally find a part I am not sure about.
If the spreadsheet isnt too big it would be appreciated if someone could email it to me.