Hey all,
I thought I would post a few pictures of my recent seat upgrades! They are Corbeau A4 micro suede seats, with the D1121T brackets. The brackets fit with no modification other than longer attachment bolts.
The seat position is almost exactly the same, though I now keep the seat in the furthest forward position (I'm about 5'5"). These seats slide back much further than the original seats- so far back that they can eliminate all rear leg room in the full back position. The side bolsters are great for track driving and are super-supportive. I haven't done any all-day drives yet, but they seem more comfortable than the original seats.
From side to side they barely fit- with maybe an inch from the edge of the seat to the door (when closed). They don't provide as much room to access the rear seats when flipped forward due to the single pivot point- making getting in and out of the rear seats a bit harder. And visibility out the rear sides is a bit reduced too.
I've had them for just over a month and am pretty happy with them. They seem like a decent compromise between price, performance and style (well- the style is debatable!!

- the seats I really wanted were too expensive!)
I hope this helps!!!
cheers,
-rich