The la243 and la344 loader will also work on your bx1850. If your tractor is not loader ready with the valve and joystick already on it you'll have to get all that as well. The hydraulic steel lines from hydraulic block to valve are shorter than the bx23xx or bx26xx as the chassis is shorter. I have valves and joysticks. La344 youll have to remove the hydraulic plate and put quick disconnects on the hoses. None of these loaders are easy to find though