I purchased my Z4 last year and planned to do the same thing.
Purchased the belt and tensioner from Turner Motorsports as part of my preventative maintenance plan.
Scheduled installation only to find that that both parts were new. I still have the brand new belt and tensioner in the box they came in.
My next plan is to replace the water pump and thermostat. ECS has a few packages to choose from so I may get these from them.
Keep us posted!
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