When I separated my stock front caliper halves in 2019 because it was absolutely necessary in order to completely clean the bores, I then installed these caliper seals from Pegasus.
https://www.pegasusautoracing....tails.asp?RecID=1144
Now 3 years, 3500 miles, and more than a dozen "hare group" Breakfast Club Rallys later, no leaks, no drips, no errors and braking is still strong, straight and true. YMMV