1975 KZ400D Carb tube connections

So I bought a used 2 owner 75 KZ400D , second owner was going to restore , never did and removed all the tubes for the fuel and carbs. Question is where do all the carb tubes get rerouted to? I checked the service manual back and forth and there seems to be no mention as to where they hook up.

No eBay APP ID and/or Cert ID defined in Kunena configurationFrom the carburetor diagram for the 75 KZ400-D at Partzilla, it appears that your bike has 2 vents & 2 fuel ports. The fuel ports are usually lower on the carburetor body. In the item below, I think the black tubes are the vents.

Think the black tubes are the fuel hoses, there are 2 needed and i have that sorted out however it appears as if there ate 4 vents. In the manual it shows 4 tubes coming off the carbs going down the back of the engine but it does not show where they hook up.