[mlewisariz]

The illustration book are Vol. 1 groups 0.0000 to group 8.0000 and Vol. 2 groups 9.0000 to 15.0000. Look at table of contents for what group covers what parts. Then find illustration for the part you're looking for. then go down to find the expanded group no. parts. it will be a number beginning with the group no, and then 4 more digits. Next, go to the part number book and see the group number from illustration and find your application (73AG in your case). Part no. will be to the rh of application. Hope this helps. Also, welcome to the community.