Well I decided to go one more step...Gen Crown and Tube. I found the Crown and Tube from CousinsUK and they arrived yesterday! Got the watch disassembled...got out the old, press-in tube using Pugwash's rat-tail file method (http://www.rwgforum.com/topic/101638-ultimate-planet-ocean-upgrades/), which is great by-the-way, and then followed arniezac's post on how measure the stem length (http://www.rwgforum.com/topic/104054-upo-how-to-install-a-tube-and-crown/), but...they were both using 45mm versions of the UPO which use a different Rep crown then the one on my 42mm 4th Gen Version. My 42mm version has a longer stem-to-crown attaching point than the Genuine, which made the original stem too short when attached to the Genuine crown, so...I had to order a couple of new stems from Ofrei. They should be here tomorrow and I will update, with pictures of the process, then...
So, as a note, if you are planning on adding a Gen Crown and Tube to your 42mm Planet Ocean, order a new stem with the Crown and Tube...
Pics coming tomorrow!