Kickplate for rear doors?

Not sure if this is the correct area of the forum for this but I would love to find something to protect the paint on the rear door sills (where my children clamber in and out) and can't find anything other than the factory (front) ones

http://parts.nissanusa.com/nissanparts/index.cfm?siteid=14&action=accessories&itemid=154817&catalogid=211

Anyone know if there is anything I can put on the rear door sills?

Thanks

I use heavy-duty clear plastic tape to protect the top tube on my bike, It's from a 1-1/2" wide roll, but I've seen widths up to 3 inches. When it get too scuffed, just peel off and replace. Should work for cars.
However, knowing kids, they could destroy even duct tape in a few seconds.

You can get some 3m clear bra material and put it on the threshold. I have some on the door edges, meant to get some larger pieces for the door threshold but have not got around to it.