The hockey puck... I was able to not bother cutting a groove in it for the pinch rails. The pinch rails will kinda cut into the hockey puck anyways and the hockey pucks are actually quite rubbery and will compress and bend a bit.
BTW, i just checked right now since I need a new jack cuz my old Kragen jack started to squirt out jack oil when I was lifting the Z up the other night to put in the sway bars, but with the hockey puck acting as a cushion for the pinch rails, the minimum jack height on a stock Z with the sport package tires is about 5.25". That's for the front pinch rails. I forgot to measure at the rear pinch rails, but i'd guess they're probably similar.
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