a size is questionable!

i needed a quick response and y'all done good!   i have been searching for
"unobtanium" lockheed 5/8" wheel cylinder kits and a pair of kits
materialised on fleabay!    these kits have the cups in them that have a
hole in the center of the cup to go onto the cylinder piston.   i have loose
assorted cups for a solid center cup here.   but these lockheed style cups
have been quite elusive!

thank you!
chuck.