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spinnnout
No need to buy a new bottom bearing but you do need a crown race that matches the specs of the headset (namely the correct width and angle to the bevelled surface that sits against the inner race of the bearing). The specs should either be available online or are often printed on the bearings themselves. Although finding a matching can be a pain, case in point only one online retailer stocked the correct FSA crown race I needed to install on a second pair of forks recently.