Need a model # for a 60" deck from a 520H

[handyman 1]

I need a couple of parts for a 60" deck under a 520H. The sticker is gone. I believe the tractor is a '91 model. Are all of those decks the same for the whole range of years they made the 520?

[Workin_Horses 14]

1990 -

original model C5-60SC01 or current model 78390

1991 -

original model C5-60SC03 or current model 78390

1991 -

original model C5-60SC04 or current model 78390

Looks like the original model #'s just updated each year but the current model # is all the same