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HI my name is Robert.....
Hard for me to say if they are metal or plastic, some home improvement stores do carry the magnetic covers that stay on top of the vent, if yours are plastic what I might do is get some 1/8 rubber and cut out one for each vent and then use some velcro on the register and the underside of the rubber, the velcro should hold it in place and prevent it from moving. OR you can change the vents to metal and use the rubberized magnet. Most RV stores carry the metal vent covers. I think once you get one out you will be able to tell if it is plastic or not.... Hope this helps some....
Hi... Was just checking in to see if my answer helped???? IF you have more questions or concerns please feel free to contact me..