Our universal tunnel kit comes in a general oversize pre-cut to fit any tunnel out there. Simply apply and trim to desired tunnel dimensions. This kit will fit any tunnel, any model, from 121" up to a custom 173" extension. Use the extra to trim out other areas of your sled too! **Order this kit with your SLED KIT and we will automatically apply a matching design & color then send it along in the same box. ***If ordered separately please specify the design and color you would like in "notes to seller" at checkout.