I ordered a scrapyard cordura sheath for 6" knife to see if it would fit the 6.5 regulator. I am happy to report it is a perfect fit and has the added bonus of being able to piggy-back a scrapivore in it's kydex sheath.

[Linked Image from i130.photobucket.com]
[Linked Image from i130.photobucket.com]

Family photo:
[Linked Image from i130.photobucket.com]