1989 Dodge B-150 o2 sensor location??????? Help

Hey Guys & Gals, Can anyone help me find the o2 sensor on this truck? I have looked everywhere and can not find it, Thanks, Ron

Driver's side rear corner of the engine.

Thanks alloro, Close, but no cigar. A Dodge buddy set me str8, It is located on the front side of the exhaust mainifold drivers side. Had to take the left front tire off to see it, LOL, looks like it is going to be a lot of fun to take it out. Any suggestions out there????/