You might have to rig the seat safety switch a bit, but they should fit. Trace the holes on you Craftsman onto a piece of paper and take it down to the Deere Dealer and see how the pattern compares.

I saw the presumed flower bud in the first shot. But nobody here can comment additionally on that without a closer view. In the meantime the next step at your end would be to look for other pictures of the suggested plant on the web. I don't know 'Giganteum' but otherwise I thought the plant looked like Farfugium japonicum also. When I first saw your pictures.

The Farfugium Japonicum, also known as the “Tractor Seat Plant,” grows well in coastal South Carolina under many live oaks in the neighborhood. I love the HUGE leaves! It comes in a spotted leopard version and a Gigantic version, too. Gorgeous glossy leaves.

It's very hard to get a proper sense of scale but that maple looks to be very close to the back panel of glass. And with a not very generous amount of space on either side as well. The bark color hints at Sango Kaku or coral bark maple and without a lot of pruning (never a recommended process for JM's), that cultivar will not stay well within those boundaries. I think you need to employ the services of an experienced landscape designer before you travel any further down a not terrifically successful and potentially expensive path. Nothing wrong with having an Asian/Zen type courtyard garden but hire someone who knows what the are doing to plan it out for you.