1" master cylinder rebuild kit alternative

I got the kits that I ordered and made some measuring. Most of the kits had seals with IDs about 15-16mm and various heights that can be used to repair a drum/drum master cylinder but the ID is too much for disk/drum pistons. One kit had seals that fit the disk/drum pistons. (The first picture of the 3 pictures of kits I posted earlier.)

IMG_20250308_113333.jpg IMG_20250319_104843.jpg
Original seals ID measured from the OD of the piston. ----------->This is a kit for WV LT 75-96. (Frenkit 125044) 3 seals on pistons.

The smaller ID seals were not included in any kit. I'm thinking of making 2 press fit sleeves (11,1mm x 15,1mm x 4,9mm) out of alumina and use the same size seals in all 5 positions. With this kit I would be missing 1 seal. The sleeve could be made for a seal with any ID.

Then there is the residual valve. There is 2 1" kits that I didn't order:

FRENKIT 125019 TOYOTA HiAce.jpg Autofren D1352 TOYOTA Hiace.jpg
These are for a TOYOTA Hiace Van 87-06. These are the only kits with residual valves I found.

There are still some 1" kits with seals that appear to have a smaller ID than the kits I have. I will probably buy more kits to sort this out.