Yep, I just ended up welding a 100mm round pipe to the square outlet and used bits of steel to block the holes off and welded them on...

Check out this link below...
http://www.nissanpatrol.com.au/forum...pipe%26quot%3B

Another way would be to utilize the existing square to round adapter that you already have and somehow connect the two round pipes up. Maybe using some sort of harder joiner and use 2 x pipe clamps???

Maybe a same size OD pvc pipe only 100mm long and force the two pipes over the PVC and hose clamp....Not sure PVC would be the go with engine heat but something similar to that which can handle heat.