That's called a weatherstrip:
Right side p/n 55176618AB
Left side p/n 55176 619AB
There's also a seal on top of both of them...
Right side p/n 4886350AA
Left side p/n 4886351AA
About all you can do is Google those p/n's until you find a place that carries them. As recommended above, Davey's Jeeps would be a good place to look for them used.