3/4 ton/1 ton calipers have a larger piston. Bolt on swap.
Then there's this for the rears.
1995 Impala SS rear rotors (Edit: the holes for the studs will need machined to 5/8")
calipers
$49.95 each Summit racing part #SUM-DSEP-55017R #SUM-DSEP-55017L
Speedway calipers with e-brake NEW not rebuilt and no core charge
$99.99 each loaded Speedway motors part #910-31046 1 left, 1 right
Caliper brackets
$9.99 each Speedway motors part #916-41009 2 needed
Brake line
$49.99 pair Speedway motors part #617-8564 1 needed (come as a pair)
Spacer for E-brake cable will fab up when needed
check these out....
http://www.daymotorsports.com/produc...METRIC-CALIPER
brackets....
http://www.daymotorsports.com/produc...CALIPER-MOUNTS
There are also aftermarket kits for the rear. Baer, Wilwood, & (I think) Brembo make 'em. Ain't cheap, though.
There's this, too...
ebay Item number:350209874828