Greetings and welcome from Alabama.
Here is the bracket I have used both on a Polaris Ranger in the mid 2000's that I mounted on the tailgate, and what I am using now on my P5 mounted on the center of the cargo basket. What I like about this arrangement is that its removable which is nice if mounted on a tailgate.
I purchased my bracket from Tractor Supply Company years ago, but unfortunately I couldn't find it on their web site but I did locate it from Agrisupply
Use this steel mounting assembly to secure a slow moving vehicle emblem on your tractor or implement. It has 4 bolt holes and measures 11 inches long.
www.agrisupply.com
Use this steel mounting bracket to secure a slow moving vehicle emblem on your tractor or implement. It has 2 nuts, 2 bolts, and a mounting bracket.
www.agrisupply.com
Also available on Amazon at a higher price, but not sure about Agrisupply shipping costs
SmartSign K-SMV-KITng Vehicle Sign Mounting Kit - Includes (1) Tractor Bracket, (1) Sign Bracket, (4) Bolts and (4) Nuts, from SmartSign (K-SMV-KIT): Amazon.com: Industrial & Scientific
www.amazon.com
Good Luck