u/Alex-tC2

So I recently picked up a 2019 Tacoma Off Road and I just noticed that the previous owner decided to chop up the seals on the roof slather it up in silicone.

My question now is where can I get an OEM (or equivalent) replacement seal, and what is the proper way to mount the roof rack? I previously had a WRX that had factory holes on the roof, not sure how this one is attached.