Camshaft timing gears:
A - Single bolt 4X camshaft gear from a 2007-2009 LS2 or LS3
engine
B - Three bolt 4X camshaft gear from a 2006 LS2 Corvette or
from a 2006-2009 LS7 Corvette engine
C - Three bolt 1X camshaft gear from a 2005 LS2 Corvette or a
2005-2006 LS2 GTO/SSR/Trailblazer engine
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.

Crankshaft reluctor wheel images:

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).

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.)