AP make a big brake kit for these cars which you will find on my website here:
http://kalmar-union.com/parts/volvo-...c30c70-brakes/
As noted on my site with this AP kit you do need to fit a set of different 18" aftermarket wheels to do the job properly, that is to avoid using spacers or thicker bells to throw out standard 18" wheels to clear the callipers which would give unequal track, front to rear....unless you space out the back too.....
I also have stock of the IPD rear HD anti roll bars.
Regards, Don.
PS I have the original AP development kit on my own car.