The first link is your idler/deflection pulley. The second one is for your tensioner...which I presume means the hydraulic one.
Idler has that funny pin sticking out of it...it is available at Autozone as a Dayco/duralast pulley...and is made by INA, which is the OE maker for us. Call Autozone and get its price on all three pulleys...might save you $ in part and in shipping.
I'm so depressed. No one wants to come see me in NYC: Sat, Oct. 8, 6 p.m. at Greenwich Village Comedy Club.
Mangofy your E46!