If you want a hitch for your FR-S for a bike rack, small trailer for track gear, or whatever, U-Haul will design & install: only catch is they need your car in TempenArizona for up to 3 days. See uhaul.com
Quote from U-Haul website
U-Haul: 2013 Scion FR-S Rear Wheel Drive trailer hitch components

Your vehicle requires a custom-built hitch


If U-Haul doesn't have a hitch for your vehicle, nobody does!

Your vehicle requires a custom-built hitch which we will gladly fabricate for you. If you are able to bring your vehicle to our Tempe, AZ Research & Development facility we'll provide you with a free U-Haul custom trailer hitch, including free installation, and a lifetime unlimited warranty in exchange for the use of your vehicle to fabricate the trailer hitch. We'll need the vehicle for two to three days. If you are interested in this offer please complete the form below and we'll contact you to schedule your appointment. This offer is only valid until one customer per vehicle can fulfill our requirements.

Need a trailer hitch, but can't come to Tempe, AZ for a fabrication?

Please complete the form below, we'll contact you with trailer hitch options for your vehicle.

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Cliff