Axia Alloys bolt-on Registration Sticker Mount.  Add the proper sized strap clamp for your roll cage and this can fit on any tube.  Comes in Black with one plate and requires one clamp.

• This registration sticker mounting plate (California green sticker plate ) allows you to mount your registration sticker on either a horizontal or vertical mounting bar
• This is our original size plate and the mounting surface measures 4.0" x 2.55"