Need help installing mower belt on tractor

Crap I'm sorry... I. Already posted a typo haha.

254860, not 680. Its an 18hp briggs and im almost positive its a 46" deck, but maybe a 42". I've seen the parts diagram for it, and that's how I have the belt installed. It just has way too much slack when engaged. I'm quickly removing hair from my head the hard way haha

I got this tractor for free, spent a night and a twelve pack rewiring it and checking everything plus adding a battery. Thing fired right up andi started mowing the next day. And I mowed right over the hundred foot fish tape my plumber left in the yard. Blew the belt and now I'm stuck fiinding something to fit.

Should I just try tractor supply co and get an 84" belt like the old factory one measured?

I gues I'm going to have to get a belt that matches the old ones length. This will be a fun adventure haha. No way the factory replacement is the correct

It seems that way... The sears "tech"just pointed me towards a bin full of belts for me to look thru. Then sugested I purchase a new tractor. Thanks buddy! Haha