Give me the measurements of the Leon handbrake/parking brake cover and I'll measure the one in my Golf and that will give you an idea as to whether it will fit.
There are two types of mk5 Golf handbrake cover, a longer one if no central armrest fitted and a shorter one with the optional arm rest. The one in the picture (bad angle) looks like the shorter one. Worst comes to the worst it's easier to trim a longer one than to make a short one longer.