Is that the actual size of blind you need or is that the actual width of the window?
As a former blind man, I know that the sizes listed on most stock blinds are the window size and the blind in the box is cut to fit that window. So if the box reads 35X64, the width of the blind will be ~34 3/8.
Check if that's the case with these blinds and then see if they have a stock 37" blind, which will be about 36 3/8, if that's the blind size you need and not the window's width.