A much cheaper (and more ghetto) alternative:
Go
HERE and buy some anderson connectors (I've used many from this place for many years, I think they are reliable). The connectors have two holes in the center line of the connector (between the leads). Screw through those holes down to your solid surface to lock the connector in place.
Then go
HERE and scroll down to buy the dust cover for the connector you bought from the exact same place
I have used their dust cover on an exposed connector since (I think) 2008 and it hasn't decayed or cracked or had any issues.
It won't be quite as nice or as clean, but it will cost you $20 and you can get it in 3 days