Amazon has many various sizes of toggle clamps. These clamps will NOT include the custom hook shown in your photo. That piece is an add-on to the actual toggle latch.
A machine shop with a CNC would be able to make duplicates of the hook you show.
Like Dave said, you probably aren’t going to find that hook anywhere because it’s custom made but those toggle clamps should be easy to come by. McMaster Carr has an amazing site and should have those clamps with a wide variety of hooks that may work. Rather than paying hundreds for a custom hook.
Google DE-STA-CO clamps. They make a gazillion different clamps and apps. McMaster-Carr is a quick source, but their prices are high and shipping, even worse. You can spec out what you need at the DE-STA-CO website and then shop by the part number. (BTW, make sure to get something chromed or made of stainless steel)
De-Sta-Co clamps are some of the best in the business. Been using them for years in rotational molding/fixturing. Knockoff clamps are far inferior to them.
We used the crap out of them at AGCO Manufacturing also… used them on all the jigs and they were welded on just about every product we made. Simple to adjust and tough !