Another Weather-Strip Thread

[Sir Psycho C10]

Hi All, I have been looking at different vendors and reading a bunch of threads to find the best products/vendors.

Question is...on the top of my doors (interior side obviously) I have a glue on style weather-strip gasket. This seems to seal against the cab seal...or real close to it. I do not see any vendors that offer this. Is this piece even needed/vital to sealing the truck? I've seen a few other trucks on here that have the same gasket installed.

What are your thoughts? 1972 C10

Thanks,
Jim