Here's how I mounted mine, with a quick release system made from a Southco rotary latch (the kind they use on equipment cases): All the parts are made from aluminum angle, flat stock, ABS sheet plastic and a couple pieces of 18 Gauge sheet steel. The cases release by just turning the butterfly latch. The locking pin is just a backup safety measure, plus you can put a padlock through the locking pin hole and lock the pannier to the racks.
This is the outside of the case:
The attachment plate with all the components comes off, so it can be moved from one pannier to another without having to re-measure the position of all the components.
This is the inside of the case:
Those Sam's Club cases look like the ones from MCM that were marketed under the name Duratool. I love them. There's at least 65 thousand miles on mine now, still going strong.
"No matter where you go, there you are."
Last edited by RCinNC; 12-17-2018 at 01:31 PM.