It's in the back...but if you open up that page, it is visible as a 3rd page that you can see no matter what page you have the manual turned to.

On the same page as the table of contents:

There is a 1:1 hardware foldout page in the back
of the manual. To check the size of a part, line
up your hardware with the correct drawing until
you find the exact size. Each part in the foldout
has a number assigned to it for ordering
replacement parts.

While AE may not have the best manuals out there, I much prefer them to the other kits I have built (mostly Tamiya). And I know it's not comparing apples to apples, but Traxxas only gives you an exploded diagram, which is nearly impossible to follow if you are trying to replace a part that is buried inside your vehicle....