This replacement support arm suits the Omnistor 5500 awning & Omnistor 5800 awning. These were manufactured before the Thule takeover and will thus be badged "Omnistor" rather than "THULE Omnistor" as now.
This is a genuine Thule Omnistor spare part, product codes: OMNISTOR 1500601312 | 15 0060 1312