Model of Bundeswehr 105mm Feldhaubitze made by Revell of Germany is old Italeri M101 kit with a few FH105 specific parts added to sprues. It is generally correct, as FH105 is indeed modernized M101 howitzer, but Revell unfortunately omitted most modifications made to real guns in their model.
Finding any reference photos of FH105 is very difficult. I was only able to find a series of 13 photos on http://www.panzerbaer.de website and based my model on them. I still had to improvise quite a lot and use my imagination to make some parts, so I don't claim that my model is accurate. It is just closer to FH105 than what Revell offered in their kit.
I used some Eduard photoetched parts from a set designed for Italeri M101 kit.