I need to find out how to install the snow plow. Has a 38" mowing deck older tractor

Hi,
Deere being the way they are, it will not be easy to find. I can give you links that will lead you only to a place wgere they eill sell it to you. I will give one in case that is not a problem:
John Deere Ag - New Equipment: Technical Publications - Equipment Search
Just type in 160 and chose Attachments
Peace,
Clarke