[lunarhighway]

not sure if these are the same but they might be related,i don't suppose they're somehow helping to keep the inner liner in place but i suspect it might have something to do with watter, either spray when you're moving or drips when your stationary.

a lof of complonents on a car have tiny bumps, dimples or holes, to allos watter to drip from them in a certain location and not collect in another where it might cause rust.

Perhaps it's worth checking after driving on a rainy cay if there's any difference in dirt deposit around these tabs or if you can see watter dripping from them.

if you ever wash the car with a hose might also be a good idea to observe what happens when you point it at this area