that is in fact an ARB bumper. It was done by a member on here by the name of Blcktpgsr. He also has a photobucket that you can view showing a lot of the modifications.
Be ware there a lot of very cool mods done to his 4 runner.but defenitly worth the read
here is a link to his page
Blcktpgsr's '97 transformation
oops some one beat me to it