Toyota Previa rear wiper adapter

I designed this part for my 1994 Toyota Previa. The OEM rear wiper was ruined and rusted. This adaptor allows the use of a 'J' hook wiper. I purchased a Bosch AR16U to use with this adaptor.
I printed it at 0.3mm layer height as I wanted it to print quickly but you can use any layer height. Also 100% infill is recommended. I have included a picture of the orientation in which i printed it. This is important because the 'J' hook needs to be strong.
The design works but it is not perfect therefo