My old brake lever is completely different than yours, see photos below and the fit is fine with the new lever which is exactly like yours.
Not sure why is that? Seems your bike has some custom brake lever or there are differences between different years?
Edit: seems to me somebody has changed the front master cylinder for your bike at some point.
I have checked fowlers parts and it seems the front master cylinder is absolutely the same for all years:
5DM-W2587-01
And the levers are the same too part number 6 above - 5EB-83922-01.
Looks to me yours is not like the one in fowlers parts above?