There are alot of choices for battery cable terminals, but you will have to make your own, usually buying a longer one than what your using and cutting off to lenght on terminal side you won't be using then install your chosen one, or if you have length on the one you have pictured, cut the head off, put another on if the rest of the cable is ok to you.. There are all kinds on line not just at your flaps or car audio installer.. ( gold plated, led digital voltage read out, and python stamped on it

)
while your at it you could re-do the red wire terminals too, they look at bit exposed and haggard..
there are more but here is a start linky..
http://www.jcwhitney.com/battery-cables-an.../c921j1s17.jcwx