I put silicone fluid in all my 62’s, that have sleeves. Not sure what dot # that is.
actually the sleeves are designed to stop leaks on the factory master cylinders with worn cylinders.
I will send pictures and price. I think i have one new NAPA kit for the master cylinder.
I keep & find good rubber gaskets for the cap since no new kit includes the large rubber washer for the lid
I have had about 8 - 62’s with sleeved screw top factory original master cylinders and I have sold about 10+ master cylinders with either brass or stainless sleeves - no leaks as I remember ( maybe had one leak - not sure I remember)
until recently no reproduction screw top factory style master cylinders were ever sold by parts places ( it’s been
50 years or more since new correct factory master cylinders were available), thats why I started having my originals sleeved and the caps & mounting screw zinc plated.
Paul