Tech Tips:
Tune-O-Matic Bridges & Saddles
Genuine Gibson & TonePro Replacements
See also: Fender Style Tremolo Bridges & Parts
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Parts
Bridge FAQ's
ABR or Nashville?
The Gibson® Tune-O-Matic style bridge comes in different styles which can lead to confusion. While there are several differences an easy comparison is the mounting post.
The ABR's bridge post are an all threaded rod and use a thumbwheel for height adjustment.
The Nashville TOM bridge uses inserts which are installed into the body, the bridge post then screws into the inserts for height adjustment. They are threaded at the base and normally solid (un-threaded) at the top.
Other noticeable differences:
Nashville bridges are wider from front to back, which increases the travel of the saddle. See Intonation adjustments for more on saddle adjustments. 
ABR Style Saddle and Screw
Chrome Or Nickel?
Nickel parts tarnish over time and will begin to look dull. This is often preferred on vintage instruments.
Chrome plating remains shiny and does not tarnish. When comparing two new parts (chrome vs. nickel) you may notice chrome looks more "blue", while nickel appears more "yellow".