Whaleman, 10x1.25mm will thread into the caliper all right, but if you're not sure if this is the fitting you need and they can't tell you, send them that half of the caliper to be sure. In my case one of the 550 calipers I used had a damaged internal taper, so I drilled the fittings out of both, tapped the hole deeper, milled the top of the calipers flat and used 90degree banjos fitiings and bolts. It would have been easier to use the threaded fitting, but I had no choice.