Hi Clint. You may have seen the same photo in the Thetford & Gray "German aircraft of the First World War". The diagonal tail stripes on "Z" are similar to Jasta 37.
I think 7788/18 may be at Colombey-les-Belles both the 85th and 25th were there for a few weeks in 1919 (hence the SE5a? ). The field was HQ for Supply Services and demobilized USAS units post-war.
On p.9 of this site is 7744/18 with the 25th Aero possibly at the same time. This is a modelling site but has some good detail shots of DVIIs. 7788/18 is on p.10.
http://www.wingnutwings.com/ww/vE472...structions.pdf
Nick