I have a Shelly Valley column in my cobra with a painless wiring system.
Green/Black connects to Dark Blue- right TS
Grey/Black connects to Light Blue- left-TS
Black wire connects to Purple which is also the Turn Signal Switch Flasher B+
The two tan wires pass through the dimmer/horn switch on the turn signal lever. This diagram from ERA may help with the dimmer wires. Also if you are using the single small square taillights you may need the converter shown here as well.
Hope this helps
Scott S