Any vinyl decal will adhere to the plastics so no worries there 
I would just try to go for a good quality vinyl, if you don't your risking quicker fading and/or the decals drying out, possibly chipping.
Some websites I recommend are;
http://www.drstickers.com
http://www.stickernerd.com
http://www.sticknwrap.com
http://www.decalfx.com/jdm_decals.html
Hope this helps.
I would just try to go for a good quality vinyl, if you don't your risking quicker fading and/or the decals drying out, possibly chipping.
Some websites I recommend are;
http://www.drstickers.com
http://www.stickernerd.com
http://www.sticknwrap.com
http://www.decalfx.com/jdm_decals.html
Hope this helps.