K260/270 and K360/370 - Front
K260/270 and K360/370 (2007-22)
The RB-384 and RB-398 are functionally interchangeable; the only difference is the eye size. RB-384 has a 49mm eye, while RB-398 has a 45mm eye. The RB-402 has identical measurements to the RB-384 but features a non-removable 49mm pin through the center.