Depth Raider's Perfect Fit series of downrigger bases are designed to fit your downrigger perfectly. While you can use a universal base, the base plate mostly likely will hang out past the edge of your rigger making for a bit of an unsightly installation. The 5x5 Perfect Fit base has a top plate measuring 5” x 5” and is designed to fit all Cannon downriggers. The Perfect Fit bases fit standard track systems from Depth Raider, Berts, Traxstech, Cannon and others. Why not consider a Perfect Fit base for your downrigger installation, and save a few bucks too!