FJ Cruisers of Northern California
Defo quality is the top priority with suspension parts. I am about to replace my rear upper and lower control arms with Metal Tech arms soon based on quality metal and oversized parts and a good history on the trails.
I have no info on the parts you mention, I still have stock. Maybe Nestor could help? Or CaliFab.
Interestingly, I would bet that more than 80% of the members here, or on I8mud or the Blue Room, have aftermarket suspension systems that may not show much difference to the Toyota/Bilstein units in an on-road situation but become a night and day difference off-road.
So the phrase; "replacing something that moves" with something non-Toyota is pretty much not correct. I think the suspension upgrade is widely popular with FJ owners and that makes a ton of sense.
My Walker-Evans suspension is so far and away better than the Bilstein set-up in off-road situations. But kudos to Toyota for at least using a decent Bilstein set-up in the OEM vehicle. They could have done a lot worse.
//I think he meant more of mechanical parts such as alternators pulleys//
When you get that whine under the hood it is probably an open bearing pulley made by Toyota. Sealed pulleys are available at RockAuto.