My two cents:
First kudu left horn is normal and looks like a good 56" but right horn just keeps on going. And why would you post a 50" kudu? That right horn must be a good 60, 61". The second kudu is as beautifully long, but horns are heavy. He could be 59 or just 60" For the eland the ring around the basis where on the measurement are taken are very parallel to the horizon which in the case of eland horn length means allot. But I should venture a guess it would be 42 at most. The springbuck horn tips flares back and the photo makes it hard to judge this feature. But he looks like an impressive 17.5"