Default Avatars in Postbit and Navbar?

[jca2112]

I'm trying to make a few things to happen:

• Every user be assigned a Default Avatar (unless they choose their own avatar)
• The Default Avatar or the custom avatar should appear in the postbit.
• The Default Avatar should also appear in the Navbar for Guests and for Users, unless they have chosen their own avatar
• The Default Avatar should also appear in every other avatar location (such as the profile, memberlist, etc.) if no custom avatar is selected

I've read and re-read every post here (and at vbulletin.com) about default avatars, avatars in the postbit, and avatars in the navbar and elsewhere. So far, I haven't been able to make suggested template edits or mods work to do the above. Am I mistaken, or does vBulletin not have a consistent/global "hook" to pull in an avatar regardless of template/location, or at least conditionals that can make all of the above happen? The $post[avatarurl] conditional for the postbit doesn't apply to the navbar, for example.

Does anyone have any suggestions on making any/all of the above work? I've looked through all the mods I could find but haven't found the right mod/combo that works -- did I miss something?

Appreciate any help/info,

-jca2112