B-80 throttle cable?

Is it the T handle style? Guessing so and if the lever & pivots are good you can just buy the wire & sheath and make one. 

http://www.psep.biz/store/toro_mower_cables.htm this website might have them or https://wheelhorsepartsandmore.com/shop-now/ you will have to check i am not filimiliar with that tractor but that might help

I have these , some are staight others are angle shaped 

@clueless what ever you get , personally use  SUPER LUBE , for end to end drip / function , H/W store . as you lay it out / installation , verify continued easy movement . don't  force the cable , into a spot where is does not want to be , have added small screw on cable clamps , at convenient mount spots , also lubricate any and all related linkage points , the detailing will pay off in  smooth / easy  direction .  just an opportunity , pete     

@cluelesshttps://www.grainger.com/product/44N750?gucid=N:N:PS:Paid:GGL:CSM-2 local H/W probably has it in stock , about 6$ a bottle , check out the operational temp  range .makes cables work like they should. Also comes in a grease form , once you use it ,you will go back for more , Pete

@clueless  often refer to "  cable clamps " "  https://www.mcdonaldcarb.com/product_p/29-81.htm  very easy to add these at any loose point , found , that firming  up a cable , along with lubrication , made for solid smooth action . only a picture reference , check local H/W store , small pull out drawer section .  any and all linkage / lever issues I used to have , are long gone , have also added pull springs to my cables , like a power assist , Pete