For your 43x43 cm fiber-filled pillows, two options from the Soft Series Cashew Color Pillowcase dimensions on our page seem suitable: - **40x40 cm**: It looks a bit tight, if you want a fuller and more compact look, consider this size. - **45x45 cm**: It will be 2 cm larger than your pillow, providing a more comfortable fit, slightly loose but ensuring a comfortable use. Generally, for a 43x43 filling, a **45x45 cm cover** might be a more comfortable choice. However, if you prefer a fuller, more substantial look, you could also consider a 40x40 cm cover. Thank you for your interest, we wish you pleasant shopping. � �️ ✨