Spindle Assembly with Bolts. Compatible with following Troy Bilt models: 13A6A1BS066 Super Bronco 42 Hydro (2019) / 13A8A1BS066 Super Bronco 42 Hydro (2018) / 13ALA1KS066 TB1942 (2015) / 13ALA1KS066 TB1942 (2016) / TB42 (13A8A1KS066) (2016). Note: Mounting holes do not have thread. Power tool is needed to install the bolts. It is designed to withstand the vibration.. Specs: Height: Height: 6 3/16" , OD of Pulley: 5 1/2". We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced..
