I am 93% sure this is the Caprice pack that is being refrenced, here is the link:
And here an image from that page:
http://www.lcpdfr.com/index.php?app=downloads&module=display§ion=screenshot&record=3930&id=88&full=1
For Tim's stuff, go to his user page, look on the left side where it says "Overview", "Profile View", towards the bottom of the list is a menu opition for "Files".
He has two files/downloads both of them are listed under vehicle categories. I am 90% sure what he is refenceing is the first link on his files page. Which this appears to a collection of other user's mods.
http://www.lcpdfr.com/user/6074-tim98/ (His Profile page, go to the "Files" tab)
(90% sure this is what he is refenceing)
While this links are lcpdfr.com based, still used your judgement and common sense with any internet download.
Hope this helps ;)