I think they were 5mm. Can check here in a few when I open my shop. Thought I had lost one on my firend's car and grabbed one from work. If you go with a different bolt, they are an odd length. I had to cut a longer bolt down about 4mm to get the exact length. Also you will have to use an allen head bolt if not the torx. There is not room to get a socket on a hex head.
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