You should document all defective parts: stripped, wrong size, misaligned, whatever the **** is
Before buying a Z1 product you should know:
1) They aren't manufacturing their stuff
2) They might not even be designing their stuff
3) They might not be testing their stuff before selling it
None of this is necessarily fatal . . . just suboptimal.
Most of their products are re-badged items made by other companies, with variance in quality. Z1 slaps their logo and the some letters and numbers and then hypes up the release
They sold braces that didn't fit and suspension arms that came lose.
I'm not shocked at all that they might be selling coilovers with stripped studs or bolts that can't be tightened or anything at all
A cursory search shows that Z1 coilovers are made by Feal - they've been around, they make coilovers for lots of cars, they use the same parts certain other labels use, just with their own specs. Feal itself seems to be fine generally.
That's the Z1 side
The other side, who the hell is installing your stuff? Have they installed aftermarket coilovers before? Do they work on Z's?
Test drive after pickup before leaving the area, always, and return as soon as possible if an issue is discovered
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