Lilb’s USRA C Gondolas from JR missing couplers.

Hello! I have recently downloaded Lilb's USRA Gondolas off of Jointed Rail. The issue I've noticed is that they are missing their couplers, despite showing up fine in Content Manager. I would really like some assistance on how to fix this issue, as I would rather not want to reskin one of the JR gondolas 20 times so it doesn't look repetitive. Thanks for any help!