I know the differences between my A and my BN as far as the steering, frt ends and the addition of a extended left axle but I don't know why there are different part nos for the platform where your feet go? My TC-26A parts catalog shows the A takes a 48699DX and the BN takes a 58845DX. I was thinking they should be the same except maybe for some hole drillings but the distance between the holes where they mount to the axle housing are different. I discovered this while using a platform from a A to add to my BN so I can add a additional seat over the LH axle. Any thoughts are appreciated...Fred