That will also go in an M41 or M41A1 Walker Bulldog tank. As Will wrote, it's not worth much to anyone who hasn't got the right chassis to drop it in. Since more APUs seem to have survived than chassis' did I don't know of anyone who "needs" one.
That said, I have a friend who has two APUs and there is a slight chance he might be interested in a third. Would you be willing to drain it, crate it and get it to a shipper?
If so, PM with what you want for it, delivered to a shipper. The owner of the M41A1 is not on SS.
Lance