I can't say for sure that you only need 1/4" but I'm pretty sure that is all you need. I know B.O.R.A. is a popular brand but I think(?) they only make 1" and up. Generally 1/4" and similar sizes are just a plate that goes on before you mount the wheel. If using this style make sure your lug nuts can get enough bite to safely secure the wheel. I'm not recommending these but below is a link to an example of what I'm referring to.