Parts required for brake caliper rebuild

[baagel]

I'm looking to get my brake calipers powder coated. They are currently painted but it's not holding up to hotter track days.

I reached out to my local shop who's willing to help me disassemble/reassemble the calipers, but they need me to bring the parts. Does anyone have a complete list of parts for this? All calipers, front and rear.

Edit- found some nice info in my second pass of searching. https://www.supramkv.com/threads/oem-disk-brake-caliper-piston-boots-front-rear.15812/

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[baagel]

So I found a few options for front caliper rebuild kits, but this is the one I ended up getting.
https://www.ebay.com/itm/285053246756
(They also have a website here https://autobrakesolutions.com/)

Rebuild kits for the rear calipers don't exist, all I found is a part number for the boot. As these are single-piston rears, ordered one for each side.
47737-WAA03

The piston seals are not available for purchase from Toyota/BMW. The service manual does highlight the replacement of the seals for the front calipers. However, no mention or illustration of seals for the rear calipers.