Thanks Bill, I think I will just go to Bobcat and see if they have some plugs for now so I can get the engine started. Progress is slow right now because work is picking up. I also found a pin hole in the radiator. UGHI think the couplers are called 1/2", but the female threaded end of the flat face couplers I gave you are #10 SAE female threads (which is 5/8"). So looks like what you need is 2 Bulkhead fittings, SAE J1926-1 straight thread O-ring port on one end and flared tube 5/8" on the other end. And you will need 2 "O" rings. You can call Discount Hydraulic Hose and ask them to verify what you need to connect the flat face couplers to the 5/8" steel tube (I'm no expert). Or order the fittings from Bobcat, 2 fittings 45K000007B, and 2 "O" rings 79K000010B, and 2 nuts 86000007B.