Fuse tap ground

Hi all, I'm looking to tap into a fuse in the box below the glove box, I'm having trouble finding a suitable point to attach a ground wire to? I did manage to find a metal bar to clip on my circuit tester to but I can't see anywhere I can screw a ground cable to though?

Any ideas?

any place a screw or bolt goes in to metal should be fine, otherwise just use a self tapping screw anywhere in sheet metal

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