You can purchase the lower door pockets separately, which I've recently done. I've tried all the fixes...gone so far as to take them off the car and glue them on my workbench, and though the glue held it didn't look that great. Which is why I bought new pockets ultimately, not to mention that you end up with new, less brittle hooks (don't forget to fish out the old broken ones, and consider applying Dynamat to the insides of the outer door skins...it'll make your car even quieter).

Good luck

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All the best, Michael
500E
300TE