I just bought a c-160 and the bottom line is I just did not know what I was doing. The problem is I noticed the engine had been changed but it looked ok and it was a k341. I got it home and noticed a lot more vibration than I thought it should have. The tag on the tractor says c-161 and I saw a post on the differences between 160 and 161 so I started investigating ( I know I should of done it first) the gas tank is on the tower and the battery is behind the engine but the engine has what i think is the large oil pan and it is mounted with 2 bolts with the right hand mounting holes with nothing in them since they are outside the frame. Do I need to find a small oil pan? Does the small oil pan mount directly to the frame? there are what look like mounting holes that might line up. Any ideas would be a great help Please don't laugh too hard.......