I say use seafoam. Yeah , ATF is an old trick but can/will eat and swell some seals. Was mostly dumped down carbs, back in the day. Or just use K1 Kerosene.
Thank you very much for the reply. My total bracket thickness looks to be about 3/4" . The 2 caliper bolt pads are 1/2" . The thicker flange area (3 bolts to hub) is 1/2" and the caliper side is 1/4 " thick. So I'm guessing these are for the 240SX brakes ???