According to Hugh A on Facebook, he'd acquired a Responder LP with the dual color modules. It was a special order thing. I asked how the modules are setup, like 2 wiring pigtails like on the 400 6-over-6, but he wasn't sure. he also wasn't sure on price.
you can buy them separately and there expensive also you can only use them in SY or SZ version Liberty's per Whelen,unless you want to fry something up or void your warranty :lol:
The new Duo lightheads have 2 wires per color per head (total of 4, each) so the question really isnt can you buy them serparately but can you buy the I/O board you need to go with the lightheads? No need to worry about burning up your old board because you wont be able to connect the new Duo lightheads to your old board anyway.