If you added pieces of wood aligned with a side of the rack tubing in some of the places where there are the small twin holes, that would constrain the extender from front-back and sideways movement, and it would just drop into the correct position. The zip ties would only need to hold the extender against upward movement, and in some scenarios the bungee cords may even be sufficient for that.
@isol Excellent. I could also 3D print another MIK adapter to fit it in place... I did that before and it worked well enough.
https://rasterweb.net/raster/2025/10/26/aventon-level-3-mik-adapter-plate/
I don't know if the ortlieb quick rack is MIK compatible, but I came up with this connection system for mine. Parts printed separate from plate for best layer alignment. Levers pointed inwards it slides into rack, turn levers 180° to "latch" onto round rack. MIK's separating latch from edge blocking is a better approach. Mostly this is a splash guard with or without the rack bag on top of it.
