I’ve used these, they work great.Or these
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Kolpin Polaris Lock & Ride Max Anchor
Kolpin Polaris Lock & Ride Max Anchor. Screw tightening Lock & Ride MAX knob& t-nut anchor used to secure various mounts& accessories utilizing the Lock & Ride.fueledutv.com
I'm sure the Thumper Fab ones are perfect for the rails, but at $27 each you got to really want them.I used the ones made by thumper fab to mount my tool box. Keep in mind that they need to be small to slip into the rail from the underside of the bed up front.