whoa whoa whoa, why cut the stock bushings when you can keep em if the need ever arise for them?
you'll see the bar go towards the front of the car from where you installed the SS under the car, where it ends in a circle that has a metal middle section, 2 rubber sections then big ass washers and a nut.
untighten nut and take off, wiggle bar off of bolt(this may require pushing the metal sleeve back onto the bolt as you push the buchings off, doesnt matter you will have to take it out anyway)
Once it is off the bolt and the metal sleeve in the middle is out take the whole thing and push it against the bolt just outside where the hole is in the middle, like your pushing it out. This takes some brute force btw but im a skinny fukk and did alright. since its rubber as you pushing that side will push into the end of the metal rod and out the other side, no cutting or damage needed to the OEM bushing, it just flexes back into shape.
Now put one wahser on, then one KB bushing(well greased, silicone grease), then the rod so the first bushing squeezes into place(takes some alignment), then the 2nd bushing also greased and the 2nd washer, tighten nut and your done.
there is an excellent tutorial on this somwhere, ill see if I can find it. and no not the TWM one, it sucks =P
edit: oh yah dumb ass me, it is on kartboy's site, lol.
http://www.kartboy.com/mazdabushinginstall.html
notice pics 3 and 4 where he pushes the old bushings out.