Unless I'm mistaken it's always going to arc a bit unless you've got a mosfet installed, a plug and play one will give you some extra functions like burst etc, but will not protect your contacts.
For it to really do anything you're going to have to solder it on to the switch mechanism, lots of diagrams out there which will tell you what to do. Pretty easy with some basic soldering.
Madbull 60 hop rubber is red and comes as a pack of two, guess it's probably that. Not used them personally so cant comment on how good they are.