Yea its ok to use them, i use them for mobile phone and sat nav, when i go off roading for the weekend, i plug the fridge in them for the drive up, i think you can get them from Blanchard's and Land Rover Orphanage still im willing to bet you can get the plugs from Maplin too, and you can still get the army lights that have the plug on them for a few ££ you can always cut the end off them and use it