the highside is the discharge side of the compressor and yes, it then goes to the condenser. being on back order, well you might be screwed. did he say you had a leak in the hose and you lost your refrigerant charge? if so, well it might be a hot road trip for ya. you might be able to get a hose fabricated somewhere. i am not sure who or where you would call though for a fabricated hose, maybe a hydraulic shop. they use high pressure hoses for hydraulic type stuff. if you know anybody that works for an A/C & R shop,(air conditioning and refrigeration) they might be able to help too. good luck.