A Perished Rubber causing grief

Nothing worse than a perished rubber......
ours is on the back door handle.
handle , lock, all working fine but we have water getting in.
Is it possible to get just the rubber or.......... who's done what to solve the problem? Silicone?

Have you taken the handle of to see why the rubber seal is leaking? i have found that usually the seal leaks because it is badly corroded behind the handle, when you try and undo the nuts holding the handle at least 1 usually snaps, then its either a replacement handle or repair the broken screw with a strong glue etc. I would advise removing it so at least you can stop or prevent any corrosion. sorry for the doom and gloom lol

The rubber is perished and slightly pushed in across the top. its all cracked etc. hoping to open it all up at the weekend.

You lucky sod! Mine resulted in the birth of my eldest child!