ABS in Orange, CA (www.abspowerbrake.com) does them. Kind of pricy though. I had an unusual slave cylinder done as nothing was available. If you can find new wheel cylinders they are probably cheaper than having sleeves installed.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine