I remixed Thomas' model by removing the chamfer on the rear. Doing so stops the silica boxes from rocking or falling backwards, hitting the spools.
They still fit fine on my stock AMS as well as the Hydra, and slide right in, but they'll stay put. Even if you push it back, the weight of the silica returns them back to their original orientation.
The author remixed this model.
I remixed this so that they don't rock or fall backwards and hit the spools.