I bought a trike conversion kit that has Independent Rear Suspension from a company here in Arizona called IMC. The IRS unit is connected to the bike by a mount that connects to the IRS unit and the other end of the mount is designed to attach where your old swingarm attached. He makes different mounts for different bikes and may have a set up for your Indian. The owner of the company is Ron and the web site is imctrike.com. I switched out my OEM straight axle on my 2020 Harley trike to the IRS unit and it rides so much smoother.