Perfomance:
https://www.bimmerworld.com/BMW-Inte...428i-435i.html
Weight:
https://www.ecstuning.com/b-genuine-...d/25117896886/
I found ebay had them as cheap as $65 but you'll have to cross ref the part number.
I also placed each know on my food scale , kinda hard to do w. the Performance one because it was still glued on to the boot. The weighted ZHP is heavier.