Welcome to the world of wrenching on your own Harley. I had the same problem on the left side. Had to go to Lowes and purchase the 3/8" SAE hex driver socket set. Then you'll need a driver extension bar from the hex socket to the ratchet. While you're there, go ahead and get the torx drivers too. You'll eventually need them!
Almost everytime I take on a DIY installation or modification on an HD, I need to get a new hand drive tool. Soon I should have all tools needed.
Today, I'm gonna install J&M 7.25" speakers, amp, and antenna. Almost certainly I'll need to make a run somewhere to get something needed to complete the installation!