Alfa 159 left wiperblade arm replacement part.

The left side of my Alfa Romeo 159 wiperblade arm broke. I ordered a new complete arm but the new one was already broken in transit. Decided to make my own part and use the original arm. U need to drill out the original arm to 20mm to be able to insert the new part. I fasted it with a m5 bolt that I drilled through the arm. This replacement part is only for the left side, the right side has a different angle to it.