Reporting question for Corners - Fender, for amplifier, Steel, 3-Hole with hardware

Product:
Corners - Fender, for amplifier, Steel, 3-Hole with hardware

Question:
How do I measure for the corner brackets to see if they will fit without ordering a set? I purchased a hand-made guitar cabinet. This is the part I am considering that is in question. https://www.amplifiedparts.com/products/corners-fender-amplifier-steel-3-hole-hardware

Answer:
Generally the edges of a cabinet will have rounded edges and the radius of that edge is the most important information to match. If you cabinet does not have corner covers already installed, than the mounting holes shouldn't be as important since you will be drilling the holes and they will not have to line up with any existing holes.