Depending upon the hood, frame, etc you can figure out roughly where it falls in the serial number ranges. Ma Deere has kept very through records as to numbers and if you contact the right people with casting numbers etc. you can get a new one through your local Deere dealer. We have only done this once in 2 yrs and I do not remember the details bet that is the other option. IMHO if it is a stamped frame steer very clear of it as those were so rigid that they were brittle and break easily.
Troy