Vacuum Hoses

Hey guys, I don't know a lot about cars so that's why I'm here. My RX8 is missing the L's that connect the vacuum hoses to the engine. What is the purpose of the vacuum hoses. The car seems to be running fine. Where can I order the parts. No one around here has any to fit it. Any help would be appreciated. Thanks guys.

what do you mean L's? and which hoses, each hose has a specific purpose.