Not sure about that yet. I posted a picture of one installed. I also posted a full image with extensions and an image without extensions. I don't like the way the step goes under the truck bed, now it looks awful, I don't like the look of that huge block when the step is open. With a normal top stage you don't even realize it's there, with extensions you see the whole stage even if the top stage loses the purpose of the amp stages entirely. You'd think that for something that costs $125 they'd make them work the way they're supposed to work. The only reason I'm keeping her in my truck for now is my WIFE's name. I'm only giving them 2 stars because they do what they say and it decreases the crotch by 2 inches. I give them a 5 star rating for keeping my wife from staying off my ass because now she doesn't fall out of the truck and it keeps her from getting really mad at me. I have a 13 F350 with a 10" lift.