use flat blades, and make sure they don't have knobs/nibs on the end that make that little plastic hold-down on the arm offset the blade. I'm using some I bought from Can-Tire but will change to the Costco Michelin in spring. I guess, as alternative, you could cut the piece off yje blade arm.
2007 e90 328i Monaco Blue
aFe Magnum FORCE Stage-2 Si Pro 5R CAI
RIP '84 e30 325e, '87 e30 325e, '96 e36 328i and 2000 e46 323i