RangerGrip 58 Mod Question

[Rlfaison]

Hi guys, I'm new here. I'm planning on modding my SAK Ranger Grip 58 Hunter. I've been searching the internet for about 45 minutes now trying to figure out what size brass rods are holding the big 130mm SAKs together. My assumption after visual inspection, and after finding no answers online, is that they're the 2.5mm rods that are in the 91mm SAKs, but if anyone has a solid answer for me I would be extremely grateful!!

Into the mouth of the wolf,
Robert F.