Ok i have a 92 accord LX. 4 door 5sp. F22a minimal mods as of yet.

I am having a really hard time finding vacuum hose and other plumbing because i dont know the sizes. i looked on a honda oem retailer and all i find is 5.5x8000 (size for bulk vac hoses) i am trying to replace all the vac hoses and fuel lines in my car. they are old and im losing vacuum but no store in my area has any idea what size they are. they all sell nominal sizes and that doesnt help. its always in between the sizes they stock (1/8, 1/4, 3/16 etc) so i looked to the internet buts its either NS or AN and i have NO idea what AN is. what are its equivalants, how do i measure, etc. Does anyone know they AN sizes that i need to buy in Vacuum hose and Fuel hose. what are hondas standards cuz i'll just buy a bunch of each and change as i go along. thanks and im sorry if thats convoluted.