Id check that you need the cailpers as the sliding pins can be more of a problem, than the calipers themselves.
Feel free to add to the discussion of what type of grease to use on the sliding pins.
https://www.ebay.co.uk/itm/154087449563
or
https://www.amazon.co.uk/ATE-Plastilube-Brake-Lubricant-Paste/dp/B00AIR1HJI
Are the BMW sachets that much from BMW? I use the BMW stuff on motorbikes brakes, and plastilube or ceratec on car brake pads/drums. Usually use silicone grease for the pins.
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Id check that you need the cailpers as the sliding pins can be more of a problem, than the calipers themselves.
Feel free to add to the discussion of what type of grease to use on the sliding pins.