I made flight cases for my DJ kit many years ago and bought stock from Penn Fabrication in Washington (UK) before they later became Penn Elcom.

These catches are fully functional and complete and sell new from the manufacturer at £8.95.  They are just taking up space in my garage as I have no intention of making any more flight cases now that I have retired from the DJ industry.

I have attached the dimensions image from the manufacturer's website along with photos of one of the actual catches.  There is visible surface tarnish on them due to their age.