Info is there. But the information is kind of conflicting.
First, if it IS a safety switch, that tractor is pretty basic and only has one safety switch, and that is the neutral safety switch. This would be it: You can purchase it here...
Second, the part number listed is not for a safety switch, but actually for a specific brand of automotive relay.
Equivalent part numbers are GM(94494959), MASSEY FERGUSON(053232R1), MASSEY FERGUSON(05323R1), MASSEY FERGUSON(32590006). Most auto parts stores should be able to cross reference one of these numbers to their own line to get you an equivalent unit. I would advise taking your original in when you go (that is a technical diagram on the relay and even without a cross referenced number an equivalent could be found).