Hi I managed to get a pair of ports that look something like this http://www.partsexpress.com/pe/showdetl.cf...tNumber=260-401 the ports are about 3.75 inches wide at the back end, the flared end is abt 4 inches wide, the port is abt 6 inches long. I guess I'll have to insert a piece of PVC piping between the two ports to get the desired length? I'll post back later with the exact dimensions of the ports once i have a chance to measure them regards