The millennium marine sidekick is the best designed and built double seat available. It's also very light-weight, made from all aluminum parts.
D-200-00 Side Kick Fishing Double Seat
Designed for Crappie/Catfishing
Will accept any seat with industry standard four hole bolt pattern
Designed for spider rigging and long lining
No-skid feet for both carpet and gel coat
Fits any ¾" pin/screw-in type receptacle
Will accept Ranger 1.77 for use as center post
Fully adjustable for height and width
17 inches of horizontal adjustments
Pivoting center
Seat pedestals are height adjustable
Material: Anodized aluminum
*seats not included sold separately