I just recently had to replace mine as well. The bolts are 35mm long M5. While I was replacing them, I went ahead and upgraded to titanium. In case you're interested in the link: https://www.probolt-usa.com/...-0-8mm-x-35mm-4.html

and the corresponding nut: https://www.probolt-usa.com/...t-m5-x-0-80mm-4.html It's not the cheapest option, but I'm hoping it will last longer than the originals.

perfect. thanks!