Alain,
The glass and rubber assembly should be gripped by the metal channel without the need for adhesive. So, is the metal in good enough condition to do that or has it lost it’s strength due to corrosion?
If the metal is ok, I would suggest you cut a suitable strip of material from and old inner tube rather than bedding the glass in with an adhesive and assemble glass and rubber into the channel. Depending on the rubber thickness, you may need to “adjust” the width of the slot in the channel to achieve a secure tight fit.
If the metal is beyond resurrection I think Club Spares may have a serviceable second hand one or you could stick a further appeal on this forum.
B…….
Alain Sauvage
Bernie