Hi. I have not found an engine yet for my tractor .I did get a response from John Shwiebert.He said  he new of someone that might have one But we still haven't gotten together yet. I have a IXB-SL that is stuck and missing carb and manifold.It also has a hydraulic pump on it  and electric start.I would like to get something that would look right in it .I have been told that there is not much difference in the IXK ,IXA and IXB.But if I am going to have free one up and look for part I would like to have it look right in the tractor.Thank you SteveS