Not being able to see exactly what this is but you asked for a "metal to rubber" glue I will share this: Most any auto parts store will sale a 3M product called "Super Weatherstrip Adhesive". Back in the day when I restored a few older cars it would only be yellow in color. Today this adhesive is available in both black and yellow. The trick to using either of these is to make sure both surfaces are clean, I used denatured alcohol for the final wipe, and to apply the adhesive to both parts being bonded. Allow the adhesive to dry just a couple of minutes then press together. IF this is an area longer than 12" I would gently apply pressure to the surface moving along the length of the surface until you feel that there is adequate adhesion. This stuff is a PITB to remove also. Good Luck
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