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Yes this is the correct bolt. You need a strut-tool, or a long 19mm socket where you can reach the HEX inside the socket.
https://productimages.biltema.com/v1/image/imagebyfilename/19-285_xl_1.jpg
Check the damper rod in the upper strut mount. You need a "special tool" or a long 19mm hollow socket, so you could reach the rod.
Mine was about 0,5mm loose, so every bump made a clunk.
For me, the issue came after installing Eibach springs and 4000km later the right locking nut for the shock piston rod was loose. Should be tightened 20NM but I guess it should be replaced when doing springs.