The_Lizard

Hi,
I am replacing my rear tail light pods with new ones, since my old ones are crazed/cracked. Do you know what the black rubbery sticky stuff is that they use to seal the pods? It looks like a new bead needs to be put on the tail light pod before pressing it in place and tightening down the four nuts. Any idea what this compound is or where I could purchase some. Thanks for your assistance/opinion. Sincerely, msv6