It’s mentioned in the product description that the bolts needed are M8. This is true, for the seat cushion. The backrest takes a smaller bolt, and I didn’t see the size mentioned. The best I could find was a #12-24, though it doesn’t seem perfect. The M6 is too big. Interesting, since the seat was a metric size. It took some time to find one that would work. I used 3/4 inch length and it seems to be fine.
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