I make sure to keep track because when I have a problem I check the AMS parts first. Of these three parts, 2 are O2 sensors and 1 is an underdrive pulley. The O2 sensors often fail so I am crossing my fingers and hoping that these don't. There really isn't much to go wrong with the underdrive pulley so I don't worry too much about that. I bought their tension rods from the 300zx club website but they had so much play between the two adjusting rods that I returned them immediately (thanks Aliaz for pointing this out). Instead, I bought some Stillen tension rods that were much beefier and which exibited no play whatsoever. I only have the underdrive pulley because I won it in a raffle at Branson Z Fest. Never pay for AMS parts!
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