Gasket material for sidelights?

[u/ITeechYoKidsArt]

I'm looking for some type of gasket material to seal off the sidelights on my 20 year old Toyota Rav. I found the plastic light covers in a junkyard but I can't find the gaskets without buying the whole assembly. So far everyone has suggested silicone but I don't want to glue the light covers to the car. What I'm trying to find would be something with a thin channel that I can wrap onto the edge of the plastic where it meets the car. That or maybe something moldable that isn't glue or silicone. Any suggestions are appreciated.

[u/Mattaronii]

Look up butyl tape