Calling all sub builders. Gap specs needed.

Hey guys my buddy has a mofo 15 with a coil out. I love the blue basket so I offered a trade I would use some of my salvaged parts to build him a new one basket and cone assembly for his purty blue basket. Now on to the question has anyone pulled coil size and and gap specs on one. The older model with the 3" vc it was d2. Being it's a PA sub I'm guessing the outside dia will be where they pull the 3" from. Hopefully they did it right and it's inside dia which all my salvaged VCS are. Trying to get out without ordering a new coil. Just looking to see has anyone pulled one of them apart to look or even recone. Don't wanna break his sub down and find out I don't have a coil to fit either.