A roof assembly includes a vehicle body defining an opening and having a track extending along the opening. The track is elongated along a track axis. The roof assembly includes a panel removably disposed in the opening, a latch attached to the panel and releasably engageable with the vehicle body, and a block attached to the panel and removably engageable with the track. The block is rotatable relative to the panel about a block axis perpendicular to the track axis.