You probably should have thought about it awhile ago. Saudi Arabia has a quota for different contries they allow in for Haj. There are specific Haj Service Companies who arrange the Pilgrimage. Saudi Arabia is very concerned about illegal Overstayers and this way they can somewhat keep a handle on the problem. This info is about three years old. But it probably is still somewhat true.

You obtain a Specific Haj Visa for the Pilgrimage.