If you currently have a Triple Bow mount from BBT, then you will be able to mount your Slider bars from your current triple mount to NBT Cradle (# D187 / # D193) OR NBT Plate (# D194 / # D195) You would just need 1" long SS 5/16 Bolts for the top position slider bar and you would need 1 1/4" SS 5/16 Bolts for the Bottom Slider Bar and can get those below. These bolt sizes are to include a flat washer and lock washer which you should  have in your current slider bars.

 If you want to change to a Triple Bow mount, then you would need to get a BBT Triple Bow mount Conversion kit here that already include the Slider Bars.