Has anyone done this conversion? can we use parts from the newer cars?

Salmanman

No one'* attempted it yet.

Some suggestions if you even have the thought to try. Look at the C bodies rear brakes, they have the same setup up front, and it may be similar/exact out back, really need to get parts from H bad C bodies and measure/compare etc.

You'll also want the cyl from the car, so you have the appropriate proportioning for Front/Rear.

I have a 99 SSEi and I figured that the 2000 model rear disc parts would do the trick. So, I had a junk yard in Ohio send me a couple of rear suspension arms complete with brake hardware. I found out that GM changed the design as to the way the arms pivot. So, now I'm looking for some disc caliper mounting brackets. I read where some of the Caddy rear disc parts would fit, but haven't found the bracket I need so far.