Hi Kieran,
yeah, we've got some 6 cyl coilpacks here along with some posh 10mm 4 core plug leads ideal for converting an RB to run with an external coil. They are destined to be packaged up as a kit with some simple fitting brackets, nuts and bolts, wire and such which will retail at £145.
We've got this setup running successfully on 3 cars now. It wires to your existing ignitor pack and it's a straightforward job if you know which end of a soldering iron is which
Drop me a PM if you're interested and I'll work you out a price for just the coil and leads