[767Jockey]

I'm restoring my Cobra, and am overhauling virtually everything. One of the things I'll be doing is replacing a lot of the bolts and nuts. Is there anything available that you all know of that will enable me to quickly and easily determine what diameter and thread a certain bolt is? I remember seeing a plate once somewhere that had numerous tapped holes in it. You would thread your bolt into the hole it fit and you then knew what size and thread it was. Do they still make these or something similar? What's it called and where do I get one? Thanks.
Doug