Mudx2 - Funny you should ask. Mirage_Man cut a Dorcy 2D down for me just last night. At this point it is an empty host. However, I plan to mod it, and understand that a Mag D HS can be made to fit. Initially I had planned to use one of the PR base LEDs for this mod. The ArcMania PR bulb works, but the output is not adequate. The EverLED base is too large as is the Mag drop-in. In addition, the light has a plastic bulb holder that no doubt would melt over time even with the basic bulb. Interestingly though the plastic holder slips into a nice, albeit thin, HS. The HS has threads and screws into the body, leaving a protruding lip at the top - much like a hotlips HS.
I have a Snap-On Tools 2D that is designed much the same way. Milkyspit modded that light with a cree sitting on top of the light's stock HS. He used a Dorcy board out of the 1xAAA. On 2D alkys the light throws as well or better than most of my lights. Sorry for the long story. I don't have the pics to add, but will ask MM if he can post for me. Good luck. KK