Thanks for the info guys.
I will go for STEG SQL650C (4ohm). They are 165mm and a 25mm tweeter for all doors. These are the specs
https://caraudioworld.eu/wp-content/.../techspecs.pdf
I purchased 6.5'' adapters for all doors which will fit on the stock speakermount and are made out of MDF. Making this all plug and play hopefully.
https://www.ebay.de/itm/MDF-165-mm-L...72.m2749.l2649
For now I will leave the dash midrange stock as I can't get Memphis Audio PRX27 over here. The stock midranges are still working good too. Maybe upgrade them later
I will also add some sound deadening to all doors