For all concerned,
The measurements given for hole placement is measured from the exterior of the cabinet. As far as actual hole sizes, those were the original hole sizes that came in the L-6 cabinets from Speaker City, not made exactly for the Peerless drivers. Measure the exact size of the Peerless drivers and make the holes in your cabinets just a bit larger, be sure to make notches for the tweeter wire terminals. If the inner dimensions I gave were 1/8 inch off, no big deal, just make sure to keep the original inside volume of the cabinet correct. As stated several times, you can enlarge the cabinet and gain more bass, but if you desire the speakers to produce a very clean tight midrange, build them to the original specified dimensions. Success!

Ed Frias
EFE TECHNOLOGY Speakers