Comparison : Item # 3HDS, 3 Inch (in) Length Saddle
Item # 4.9HDS, 4.9 Inch (in) Length Saddle
Item # RA04, 4 Inch (in) Length Arm
Item # RA06, 6 Inch (in) Length Arm
Item # RA08, 8 Inch (in) Length Arm