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I got two BR-M985 calipers off ebay for about £15 each, one was missing the pad retaining pin and the other was missing the banjo bolt and the pad retaining pin's R-clip.
The Saint banjo bolt is a stubby M6ish, about 12mm long and fits parallel to the caliper mounting bolt. The M985 banjo bolt is the longest banjo bolt I've ever seen and runs parallel to the axle.
Don't have a 7mm spanner, but managed to get a decent amount of fluid syringed in and didn't lose much before closing it up again. Finished it of dripping into the lever reservoir, then spent 15 mins trying to dry the mineral oil off the caliper, lever and my hands. I should get some gloves.
Fitted some part-worn finned resin pads that were on my fatbike (gave that a brake and drivetrain refurb before a week in the Pyrenees). Should have a few hours to test it and bed in a new rotor before first game in this weekend's polo tourney in Lyon.
The hose fitting will be the same, but the bolt may be a different length. You can re-use the old bolt if it's not damaged though.