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Yes indeed, flat mount. Oh yeah you think current barb will be just fine? If so I'll take a look at the more modern compatible callipers from R7000 and R8000 series Shimano to see if they're more available.
Any view on whether the more modern ones are less likely to leak fluid past the seals after a while? First time this happened I thought bad luck, but this is the 3rd time in 6 years now. It's clearly just a poor design.
hazzelfrazzel-
It's usually the ceramic pistons that go rather than the seals. Mostly pushing them back in at a wonky angle, but they're quite fragile and can just break. I'd guess the UR300 doesn't use them so you'll not need to worry about that, just be wary of the front caliper having it's adapter built in so front only for whatever the fork is set to rotorwise (probably 160) cheap AF though.
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Combination of bad design and bad luck.
Usually after a good clean it'll stop the leak.
snottyotter
coventry_eagle
Nah, the hoses are pretty much the same, you'll just need to get the correct barbs.
You can probably even just reused the barb and olive as it is and just plonk a new caliper on there.
Flat mount caliper?