[Lynne]

Moved to General vB Discussions.

If you turn on debug mode, you will see a list of all the hooks available for that page. There are several showthread hooks:
showthread_start
showthread_getinfo
showthread_post_start
showthread_query_postids
showthread_torrent
showthread_query
showthread_postbit_create
showthread_similarthread_query
showthread_similarthreadbit
showthread_complete

Along with several postbit hooks:

postbit_factory
postbit_display_start
postbit_imicons
postbit_attachment
postbit_display_complete

And a ton of others. You really need to look at the showthread.php page and see exactly what variables you need available (if you need a $post variable, you need to use a hook after the $post variable is defined) and what templates are evaled at what point.