Imperial German Shoulder Boards Officer Ranks?

[Wblastoff]

Hi Guys I recently aquired these shoulder boards
It's not to hard to figure out the regiments but can you please help me with Rank?
That is tough for me!

Thanks

Bill

[aicusv]

In the first photo left to right;
Top row: One Year Volunteer GR 110, Enlisted FAR25, Lieutenant FAR 8
Bottom row: Hauptmann LIR 115, Lieutenant IR 121, OberLieutenant GR 1

GR=Grenadier Regiment, IR=Infantry Regiment, FAR= Field Artillery Regiment

Hope this is a help

[Wblastoff]

Thank you very much!