Dont anyone go Volvo calipers... they are utter crap!
My FJ1600 had them and after rebuilding the calipers 3 times. I still found them to be pathetic, so so so heavy and small pistons, then you got problems with x feeding the fluid to the second piston unless you run a T and two lines. I couldnt do that with mine as I had a dogleg bracket on the 240k coilovers to lift the caliper up so it wouldnt foul on the tie rods and steering knuckles
My setup used a big vented disk tho but had to be drilled from 5 to 4 stud and it cracked between the holes, not worth stuffing around with
Seriously pick up a set of R32 gtst alloy calipers and you will be amazed just how light they are, and they will put your head through the windshield compared to the volvo ones
For the record also, pads are hard to find for the smaller of the volvo pad types. I had to search for months for old 80's stock pads, keep your option open and use something that has propper support from bendix and the sort
A Datsport setup is something thats worth investing in... I would never want to stuff around with that volvo crap again. Have had no problems with me and my mates Datsport setups, bolt in and pass brake tests no worries. Keeps the insurance happy too
Nomis