If you want to admit it privately you can IM me, thats ok. Just kidding. /forums/images/graemlins/smile.gif Anyways, working on my rear 10/12 bolt disk brake swap with newer camaro calipers. Camaro calipers used at least from '93-97. I guess the only real important measurement is the hub diameter (and to lesser extent overall diameter). 10/12 bolts need a "hub" (the raised center section at the outer end of the axle shaft that the wheel lines up on) that is 3.57" diameter. Smaller than that is fine, it would be acceptable to open the hub up on the rotor. Interesting tidbits that lead me to believe Toyota may offer the right piece: 1985 Toyota truck 12x.25"(diameter/thickness) solid rotors, 3.75" hub. 1992 Toyota 11.25x.875" vented rotor, with 3.75" hub. For comparison, the Camaro rotors are setup for 11.5x.75" vented rotors, but they can fit anything up to about 1" thick looks like. (I crudely test fit some 1" rotors to them) Should be able to fit a .75" rotor if you ask me. Diameter is also not that important, the bracket that will need made can accomodate bigger diameter, at least up until the point the caliper hits the wheel. But that should be over 12", since the big cadillac calipers clear 15" wheels. I had the parts counter guy pull a 1/2 ton '88 IFS GM truck rotor because I was told they were thinner than 73-87 rotors, but the piece he brought up was 11.5x1.25". Interestingly, the hub was smaller at 3". So if it weren't for the thickness, the rotor diameter and hub would work fine. Kind of doubt GM went even thinner on them later though.(?) Can't really be sure the guy brought me the right part of course, but since it doesn't match the '73-87, I'm assuming he did. Maybe the "earliest '88+" rear disks from a GM truck would work? Can't have the integral drum parking brake methinks...I should be able to find that info somewhere though. Pretty particular specs I need, but to be honest, there is not a better board out there for knowledge. If every vehicle had a message board with knowledable people like this one, everyone would be their own mechanic. (if you don't believe me, try finding info about, say, an early 90's Dodge Ram VSS /forums/images/graemlins/smile.gif) Anyways, I guess if you can't help out any other way, the URL to a *good* board that has people that deal with this Toyota stuff might help a bit. Hmm, can't think of anything to make the post longer!