Yes yet another suspension question

im hearing and reading that i can replace my air shocks with regular gas shocks. i went to jcwhitney.com and see several rear shock for the non leveling armadas

my question is what is the collapsed length and the extended length of the factory orignal shocks

anybody reccommend a specific shock (model#) please my compressor works fine but both shocks on my truck stay flat. dont have the time or $$$ to replace everything that comes with the air suspension

planning on using my working compressor to power the train horns i bought