I have exactly the same problem so I made a box that I then welded to the side of that round air filter housing, having ciut a hole in it first, welded a piece of tube to the box and connected the snorkel flexi to that tube, I then blanked the original air intake. As a bonus i have shortened the length of snorkel flexi, which is good and I have both cold air from the snorkel and 'normal' under bonnet air if I remove the front cover of the air filter.
The only probalm is the atandard air filter housing is made from tinfoil and very difficult to weld.