Available in Plain steel, plain stainless steel and polished stainless steel (the plain steel version includes an S-style stiffener (unwelded); the stiffener gives greater strength to withstand hard acceleration). All will have 5/8" RH fine threads. Chrome and stainless units have the stiffener welded in place. Use 5-3/4" bracket for clevis mount center bolt spacing.
NOTE: Photo shown with s-style stiffner