Pinbox upgrade on Bighorn 3070RL

[Dynatrak]

I've decided to upgrade the pinbox on our Bighorn 3070RL. I think I want the Lippert Flex Air. Does anyone know what model pinbox is on a 2013 3070RL?

 

[Bob&Patty]

Should be a 1621 HD.

 

[Dynatrak]

Thanks Bob. Couldn't find the model number on it.