SmokTech dual-coils to use in the MV tanks, but he cut the tank to accommodate the shorter carto. Different sources show XL Boge cartos, but I don't think any of them are as long as the SmokTech DCs, so it's probably better to just adapt the tank to the carto you prefer if it's not the length of the DCs.
The delrin version from MV has very good reviews.
Sorry to rain on your thread, Dying2Live. It wasn't my intention.