In an effort to avoid using WD-40 in our cold upstate weather, I bought a block heater (AT74940) for my backhoe. Odd thing though, I've only found one reference to the installation location. That reference mentioned a threaded plug that needs to removed on the left side of the block. I'm guessing that most folks wouldn't have trouble finding that plug. But, between me and my equally handicapped neighbor, we never found a plug. I tried the right side of the engine and saw 2 possible plugs. When I tried to unscrew one of the plugs it hex head easily broke off (as you can see right behind the oil fill). I've attached pictures of the right and left sides of the engine. Thanks in advance for any help!