Hello Dylan Good morning, I wasnt sure what exactly you are asking for but if I may had understood right you are searching for a piece like that: http://www.ebay.com/itm/Samsung-Galaxy-S5-i9600-Rear-Back-Housing-Middle-Bezel-Frame-Camera-Lens-Silver-/111381010673?pt=US_Cell_Phone_Replacement_Parts_Tools&hash=item19eed358f1
Now to replace it I wont find a specific guide, but this one here from iFixit looks excellent for me, just unmount your device following the guide till you reach the part you need: [guide|24016]
and once complete just go backwards on the guide.
But if is just the little frame bent and only visually I would recommend you to let it really break something like screen or what ever because it can always go wrong and loosing a s5 because of a rear scratch may sound dumb
Cheers mate