The best thing to do is to take it back to the MoT centre that passed it, and ask them to produce you with proof that its legal. That'll be the best way to prove that. As for the the rubber strips, there caravan spacers, to stop the car bottoming out when towing heavy loads. They don't really raise the suspension, like i said there more to stop the car bottoming out. Ive used them on a few of my motors when ive had big wide rims to stop them rubbing. Anyway best of luck with it.