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Both regular & inverted struts have internal bump stops. That said, the stock struts and suspension are not meant to be used with lowering springs, the shocks won't last long. That clunk could be binding bushings or an incorrectly seated spring, loosen every rubber bushing in the front suspension; control arms, tie rods, sway bars, etc. then lower the car on ground, move back and forth a few feet to settle the suspension & torque all bolts again with all 4 wheels on the ground or on ramps. Bottom end of spring sits on the 2nd of 3 marks on spring perch and top end follows the spring angle. You should have marked where the old spring sat on strut mount, if not look for service manual to position spring correctly. If the thick washer is upside down, that can also cause grinding or binding.
 

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Doubtful, it was probably something loose. Springs settle in the first few miles but don't make any noises. You still have to loosen and tighten all bushings under load. Rubber bushings don't let bolt spin like urethane, they twist. If you change the ride height, now all bushings are sitting twisted for most of the day and will go out quickly.
 
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