Must admit I've never come across a new 'faulty' caliper. Back in 2021 I refurbed the all the brakes on mine, rears (genuine) only needed new seals but with the fronts it was cheaper to replace the calipers (I intend to overhaul the originals as they're genuine but haven't got round to it yet
). Not sure on the make (of replacements) but they've been fine, in fact to this day I still impressed at how well it stops (full set of Mintex discs & pads at the same time). Anyway mine come from Lr-trade-parts-uk. Keep us posted,all the best.