Attached is a picture of the drawbar for an L2550. I believe it is the same as the one for the L2850, as the owners manual covers both tractors. Also, I think you can download a parts manual for your tractor for free. Good luck.
Stumpy -- I just bought a 1986 L2850DT(small world!) ... also w/o the drawbar.
Did you wind up making one ... or finding one new. I'll be searching soon // just haven't gotten enough bush-hogging done to take it off and check things out yet.