Taken from reviews section, thread by brightnorm, instant specs for popular flashlights.
MODEL…….…….....LGTH …..BZL DIA ……BOD DIA ……WT…….LUMENS/CP
9P*………………...….......6 3/8"……....1 ¼ "…………..1" …………....6.7oz……...105/200 L
Stinger HP……………… 8 5/16"….. 2 3/8"………….1 1/16"…..11.8oz……………….40,000 CP
* Add 1/8" to length for pushbutton
Taken from streamlight.com
7.4 inches Length
So, the length and width/body diameter are important. 7.4" / 1 and 1/16" for Stinger and 6 and 1/2" / 1 and 1/4" for body diamter.
Looking at numbers, I think the 9P will fit really snuggly/not at all into a stinger holster based upon body diameter. The 9P is also almost 1 inch shorter.
I am sure BDS tactical (formerly SOE gear) and Blackhawk gear, maybe even MAxpedition makes holsters for the 9P.