Gregg, does not seem like anything is the same on the left and right hand side of boats. My V-153 seats were different. Paul had to mark all the wood on the seat bases to make sure. I bet the Glastron factory takes a stock seat base and conforms it to the boat configuration seat by seat. With the different stringers, depths of fiberglass coatings, different carpet depths, there is give and take. We think it is exacting from the factory. Bass and Walleye Boating magazine would test identical boats, but the weight would vary maybe 50 pounds from boat to boat.
