hi, ok, now it makes more sense! I just did both of mine last week. Here's what you do.
First, the lower IDLER, (not pulley). This the smaller one on the pass side by the alternator. You have 2 choices, rebuild or replace. To rebuild, you will need a 6203 2RS bearing. This is a common bearing, and should be available anywhere bearings are sold. About $5. Then, find a buddy or a local shop with a small press, press old one out, new one in, and you are good to go. Don't be tempted to hammer bearings out/in, you will probably ruin the idler and/or the new bearing. Alternatively, for more money, about $15., go to your local Advance/Autozone, etc, and ask for a Dayco #89052. This is an idler for late model serpentine setups, and, besides being about 1/8" wider, the same as the original AMC.
Second, the UPPER tensioner pulley. This one is not easily rebuildable. Again, go to your local Advance, etc, and ask for a Dayco #89020, OR Gates #38038, and maybe the bolt, Four Seasons #45920. I reused the bolt out of the old pulley, though I had to ruin the pulley to do so. Essentially you have to cut/grind the pulley bearing face cap off, in order to get the old bolt out.It IS a special bolt, with a flat on it, so I thought it was worthwhile to keep. Up to you. again, good luck, gz