Installing Kelsey Hayes Caliper Pistons ?

I just took these pictures. The car had sat for 40 years. I had a hard time getting the old pistons out. Most of the problem was rust on the pistons. The bores were in good shape. Just cleaned them up with Scotch Brite. The calipers were glass beaded. I have 8 new pistons.
I read one of you earlier posts about the McKay Lube, but I have been unable to find any so far. I have also heard where some people have used silicon grease before. Not sure if that is the right way to go though. I also wondering now if maybe I should lube the seals with DOT 3 instead of DOT 5, if that would make any difference?

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