We do have trailer hitches to fit your 2019 Mazda CX-3 that are similar to the part # 90092 that you referenced.
The available hitches for the 2019 CX-3 are the 1-1/4-inch size like # 90092 but they are lighter-duty Class I hitches. There are not any Class II hitches for your car.
The available Class I hitches are Draw-Tite # 24933 and Curt # C11418. Between these two I recommend the USA-made Curt # C11418 because it will be easier to install. A video and the instructions both are linked... view full answer...
The Replacement QuickAccess Interface Top T-Track Strip # 1500052989 is only available as a pair. Unfortunately, Thule won't sell a single strip so this is the only option. view full answer...