If you have the old remote (RJ45 6 wire plug) then I don't think they are made anymore. If you have the new remote (RJ15 4 wire plug) you can get the remote, but it is universal, both wired and wireless and costs nearly as much as the whole wireless conversion kit ($195 vs. $230). Might as well do the conversion. It is very easy, unplug the wires from the controller, replace the box with one of the same size and screw locations, plug the wires back in. That is what I did when faced with the same dilemma.
Bigfoot 10.4E, 2015 F350 6.7L DRW 2WD, Autoflex Ultra Air Ride rear suspension, Hellwig Bigwig sway bars front and rear