Don't buy Corsair's single bay mounting bracket if you're going to install an SSD in your iMac. It will NOT fit standard 3.5" hard drive bays as stated on the packaging and website. This bracket is significantly smaller than a standard 3.5" drive. Instead, it is recommended to purchase the NewerTech AdaptaDrive (see attached image).
4 TB External HDD Seagate One Touch, USB 3.2 Gen 1, black
28 Review
Hard Shell Case with 5 Attachment Slots for Hyperice Hypervolt Bluetooth, Portable Storage Box for Hypervolt Portable Massage Gun - Case Only
11 Review
External sound card Focusrite Scarlett 2i2 3rd Gen
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1 TB External SSD Samsung T7, USB 3.2 Gen 2 Type-C, grey
15 Review