Hi,
I recently shared with you my own models and print profiles for C-size RAM mounts. Today I'm presenting brackets and arms that work with B-size RAM mounts. These arms have 4 different lengths between slots:
- Short 50mm
- Short + 65mm
- Medium - 80mm
- Medium 100mm

For assembly, you'll need at least an M8x50 or M8x60 bolt and an M8 nut. I use steel bolts because the printed bolts were too weak. For ease of use, I use a butterfly bolt knob, which is perfectly suited for this application (https://makerworld.com/en/models/809700-butterfly-knob-for-hexagonal-screws-m4-m5-m6-m8?from=search#profileId-750783).