The details of the Bayern R5 can be seen in the book Feldzug 1915 by the late Michael Baldwin, and the details of the IR165 can still be seen on the Age of kings website. (for now)
The JR165 was available such a long time on AOK...Astonishing!
I also was interested since the first day it was online, but the price was not the one for me, without wearers name in it to check the matching between both pieces....