Skribnod, the Sig wheel pant pictured on their web site is the sigsh728 which is a wood mount that goes inside the wheel pant and then is bolted directed to an aluminum landing gear. The other ones listed are like the one I pictured in the earlier message and come in 4 different sizes. These slide onto the axle and are attached to the wheel pant and held in place with a set screw. Don't know why Sig doesn't show a picture of those. Hope this helps.