I've been simulating shuttle flights from the (very optimistic) 1977 Flight Manifest.
July 1979 - STS-2A
OV-102 Columbia on its second flight makes a rendezvous with Skylab and reboosts it for future reuse.
Prior to ignition of the TRS to boost Skylab's orbit.
After the reboost, Columbia makes another rendezvous to retrieve the TRS.
Scenarios use Shuttle Fleet 4.8 repainted with SSU textures, Orbiter version is 2010 P1. The orbital elements of Skylab are the historical ones from July 4th, which is when I have the scenario start, with Skylab starting in a roughly 220km orbit.