Already posted this on i-club, but though it may be
useful info here...
After 4 hours of grinding MY00 Impreza brackets, they are in!
The rear seats are stock, but I plan to get matching
Recaro fabric and recover the rear seats and the door panel
There is a chassis bump/ridge near the mounting hole
closest to the seat belt bracket. What I had to do is grind
off a triangle shaped piece off the square seat bracket to
clear the bump. Even with the grinding, it did not go down
far enough (the hole is slotted) so it sat 1/2" higher in that
corner. What I did to fix that was used a 1/2" spacer on the
other side of the bracket and a longer bolt to make the
rear of the seat sit level to the floor. Also, the seat belt
bracket will hit the center console, so I just had to bend
it back a little to clear. I'll get some better looking spacers
made, as I'm just using a big nut... but overall I'm pleased
with the fit.