How do you decide the right dildo for your personal harness? Depending on the harness you may be able to switch out the “o-ring” ( Aslan ) that holds the dildo in place, so the width ( or girth ) of the dildo does not matter as much. If your harness is not flexible ( Rodeoh & Spareparts ) it may only fit dildos under 2” wide such as the Fuze & Tantus selection. Many of the Fuze harness dildos point upwards like a genuine erection and have a slot for a vibrating bullet, while other dildos point straight ahead. Keep your eye on the items size description to make the best choice for you.