Not to my knowledge. One of our local RV3 builders had his slider welded up per the slider option drawings by a local aircraft builder. It?s kind of a custom fit deal. All of the RV3s on the field (5) have sliders and all present some rather unique entry/egress issues. Especially if you are wearing a backpack parachute. I have an older RV3 with a slider and it?s snug.
Good luck