Seat cushion measures: about 18 x 16 at the base. The measurements are shown in the pictures. This is the exact original fit no modifications are needed!! Doesn't your tractor and behinde need the extra soft cushion.This aftermarket seat is Made in the USA. Comes with: All NEW MOUNTING BOLTS, NUTS AND WASHERS TO ATTACH TO YOUR FRAME. The item "Seat For JOHN DEERE seat M MT 40 320 330 420 430 435 440 new" is in sale since Sunday, January 28, 2018. This item is in the category "Business & Industrial\Heavy Equipment, Parts & Attachments\Heavy Equipment Parts & Accessories\Antique & Vintage Equipment Parts". The seller is "bakt4kids" and is located in Wauseon, Ohio. This item can be shipped worldwide.