Hello,
Currently on ebay are photos of:
Brandenburg C.I (Ph) 26.35
https://www.ebay.de/itm/175056395032...gAAOSwpvBhsQ0A
Brandenburg C.I (Ph) 27.50
https://www.ebay.de/itm/175056404105...AAAOSwnoBhsRIR
There are other,not terribly high quality, photos of KuK related aviation subjects at:
https://www.ebay.de/sch/m.html?item=...w=KUK&_sacat=0
Regards,
Clint