W124, how to put vinyl back onto door pilar?

[jbach36]

I took the door pilar column off to try to fix a lazy seatbelt. I was hoping to lube something, but didn't see anything to lube. Tried to put the hard plastic column back. There's some vinyl that goes behind the plastic part to give it a nice finish, but I can't get that back right. It's too short to put in on both ends, they must have done it one end at a time somehow. I'm sure there's a trick to it. Anyone know how to do this?

Thanks,

Jeff 1991 300d, 100k