Replacement Window Measurement

[Eddy Dumire]

My contractor just provided me with the window measurements for my newest rental house.  He's telling me that we have two window sizes, 31.75 x 45.625 and 27.75 x 37.875.

Home Depot sells standard windows that are 31.75 x 45.25 and 27.75 x 37.25.  Are these close enough or do I need custom windows?  The American standard windows in HD are $147 and $129 respectively.

These are replacement windows for an all brick home built around the 1960's.

Thanks in advance!