Internal head dimension Aleph Mule vs PD Mule?

[DDS]

SGT. LED makes glow rings for the Aleph Mule and I would like to have one made for my PD Mule. Does anyone know if the dimensions inside the head are the same? If not, can you tell me the exact measurements of the PD Mule so I can relay that to SGT. LED?
Thanks,
Dave