This is what mine look like. I used an old piece of 4" X 6" pressure treaded wood I had hanging around the house and screwed a piece of 1" thick decking board to the bottom. I have a lot of wood working equipment in my basement so I got a little fancy on the angle cuts and notching. I also fastened a piece of rubber to the top notches so that the bike rests on a nice soft material. I like to spray paint the shit out of every little project I make and these jacks were no exception...
Note how those little notches in the inside part of the 4"X6" help the stands get closer to the bike.