Deck Belt for Hustler Raptor SD

I am looking to buy a spare belt for my 54" raptor sd. I am finding info saying it is a 5/8" x 143". Can anyone confirm this is the correct belt? Or does anyone have a source they used to by a good belt without paying stealer prices for OEM? I was thinking it might be a good idea to have a spare tension spring as well.

Deck Belt for Hustler Raptor SD