In the case of slanted bottom-hung windows, it depends on the angle of the slant. In other words, "how slanted" the window is. Therefore, we need the sash height on both sides to find a suitable drive for you.
Currently, we are in the process of creating a specialized buyer's guide. Until its completion, please feel free to send us the completed checklist, which you can download here. It contains all the important dimensions that we need to be able to provide you with a quotation.