Dear Experts

I want to print cheque. For this I scaned cheque and paste the image in report writer. The cheque size is Height=3.5 and Widht=6.5, I am using Letter size landscape paper. In report page setup I adjust Height=3.5 and Widht=6.5, but in print preview the paper letter appears instead of my given size, Height=3.5 and Widht=6.5

How to show paper size Height=3.5 and Widht=6.5

Please help