I ordered the wrong carrier for my mountain bike, so I created an adapter to fix the front attachment to the bike. 

It uses the horizontal column between the forks and is very strong.

Printed at 100% infill for maximum strength.

Diameter of the column: 2cm (Seems to fit most bikes)

You will need two threaded M6 inserts for this adapter to work. Use a soldering iron to heat up the insert and push it into the two holes. The holes are fairly tight to ensure a secure fit, so make sure to screw in the M6 screws when it is still heated to remove any plastic residue. 

If you need a version to support nuts instead of the threaded inserts, just write a comment and I will modify the model.

You can use the M6 screws that were included with the carrier.