Check in the link below. It contains some extra collars you could use:
Item Pack 2 (http://www.mediafire.com/download/q9p0g5ecikh4joi/Item+Pack2.zip)
1. You shouldn't post your problems on another's thread. You should start your own thread in the Game Help section.
2. Are you sure you placed your files correctly? Once you download the items, you should place all the items in:
FeralHeart>Media>Items
You then need to move the items.cfg file in your main FeralHeart directory. Be sure to overwrite any duplicates.
If you follow those steps, it should work for you after you completely exit out of the game and re-launch it.