Raptor SD 48" Deck Belt #?

All, I've been looking all day to try and figure out what belt my mower requires for the deck. Best I can tell, it is #602078. Is this correct? Is there an alternative that might be cheaper/more readily available? (I saw recommendations for non-OEM drive belts, but not for deck belts.
I really need to pick one up today, or order it today, and forgot to get the model # off the mower this morning.

THANK YOU!

According to Gates it is a 6878BR which is a standard B section x 169.875"
Which in reality could be interchanged for a B 170.
Just remember it has to be a kevlar fiber reinforced belt.
Having an electric clutch it is not necessary to go to a wrapped belt other than wrapped belts do not get sticky so tend not to pick up sticks & stones.
All of the aftermarket suppliers will do an alternative belt and some will do OEM or OEM spec belts
So Oregon, Rotary, Stens & Prime Line will all do a know good quality replacement belt.