The linkages plates from 2010 and 2011 Anthem X frames are inter-changeable. What is interesting, is that the 2011 plates are lighter (by 4g) than the 2011 plates.
2010 linkage plates
2011 linkage plates
Related articles:
Anthem X rear triangles compared
What cost progress?
11 speed mountain bike cassettes compared
Weights and ratios
Giant Anthem 0 (2007)
This is the first iteration of the Giant Anthem with the maestro linkage and gets 3.5" of suspension travel out of a 152mm x 32mm (6.0 x 1.25") shock.
Fox Float R Rear Shock - 2010 Model
The above shock came off a Giant Anthem X3 2010 model. The compression and rebound tune indicators on the air can show the middle level tuning for both compression and rebound.
Anthem X Limited
Frame is large and without shock but with all shock mounting hardware, headset cups and derailleur hanger it weighs 2221g.
Redline rigid 20" BMX forks
These have a brake mounting hole for a road type caliper.