Very pleased with our initial order of perfect-fit blinds for the back door so decided to fit the same to our patio doors. I made the mistake of assuming the depth between frame and the glazing to be the same. When I fitted the new units there was quite a large gap between the frame of the perfect fit unit and the doorframe. I emailed to ask for advice but was told there was nothing that could be done. A quick search on google and I found some slightly shallower brackets (18mm vs20mm) and self adhesive tape available from another company. These have now arrived and I’ve fitted them and am very pleased with the result. Overall a good product, just be extra careful to double check your measurements and shop around if you have shallow units.