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The Chevrolet 2007 LS2 & 2008 and newer LS3 engines have a single bolt camshaft sprocket design and uses a spring-loaded chain tensioner. To install the earlier style camshaft with the three-bolt sprocket you need this kit. Kit includes three-bolt sprocket, 3 camshaft bolts, chain damper & special bolts with sleeves required to install.
Descriptions of camshaft timing gears from 2nd image
A - Single bolt 4X camshaft gear from a 2007-2014 LS2 or
LS3 engine. GM part number 12591689.
B - Three bolt 4X camshaft gear from a 2006 LS2 Corvette
or from a 2006-2009 LS7 Corvette engine. GM part
C - Three bolt 1X camshaft gear from a 2005 LS2 Corvette
or a 2005-2006 LS2 GTO/SSR/Trailblazer engine. GM
part number 12576407.
D - Three bolt camshaft gear from a 1997-2004 LS1, LS6
or other Gen III V8 engines. No reluctor teeth are
on the timing chain gear since the camshaft position
sensor is at the back of the block and senses the
camshaft speed from the reluctor machined into the
back of the camshaft itself. GM part number 12552953.
Crankshaft reluctor wheel from 3rd image:
Left image - 24X crankshaft reluctor wheel
found on all Gen III V8 engines (LS1, LS6,
LQ4, LQ9) and early Gen IV V8 engines
(2005 LS2 Corvette, 2005-2006 LS2 GTO,
2005-2006 LS2 SSR). GM part number
12551520 or 12559353.
Right image - 58X crankshaft reluctor wheel
found on later Gen IV V8 engines (2006-
2007 Corvette LS2, 2006-2009 Corvette
LS7, 2008-2009 Corvette LS3 etc.). GM part
Not shown - LS9 58X crankshaft reluctor wheel.
This reluctor wheel is smaller and diameter
and requires a different sensor.