Now that the 1550 is moving on it's own power, I need to put a new seat cushion on it, does anyone have a pic of exactly what should be on it? The seat on it right now has a picture of a bulldog on the top section of the backrest...what's left of it. Needless to say I don't have a pattern to go by. Although I have looked at quite a few on line there seems to be a number of seat options? Any thoughts would be appreciated.