For music, the conservative equivalent is obviously country, especially since it's not just listened to in the South anymore.
For brands, I agree with Chick-fil-A as a proxy for the group that OP stated. Living in perhaps the epicenter of those types of voters, you would be amazed at how long the lines at Chick-fil-A get (they often back up traffic on nearby streets). Another cultural signifier I would add on the right is college football. There's a reason that Trump has taken such an aggressive stance in favor of college football being played. It might not get as much attention, but college football's fanbase is basically just as conservative as NASCAR's or golf's.
https://www.businessinsider.com/politics-sports-you-like-2013-3
I am from an epicenter of those kids of voters as well and can relate to the long Chick-fil-A lines. Their drive thrus are also shockingly efficient. Good point about college football. Most of the top CFB viewership markets are in the South or adjacent to the South (with the exception of some Ohio markets). There are lots of Chick fil A and Academy Sports ads during college football games as well.