Be sure and use 5/8" wheel cylinders for the rear of the Moke. Too much brakes on the rear of a Moke will make you do 360's. Back in 92 (I think it was) I flew in from England and Mark Caldwell rode to Canada with us for MME. We towed his Moke up there and one day during the Meet we blew out a wheel cylinder on the way to lunch. Took it back to the hotel and did a brake job in the parking lot. Not knowing any different, we put Mini saloon cylinders on the rear and off we went. A little bit of speed and some braking and all of a sudden the Moke swapped ends right in the middle of the road. NO, TOO MUCH BRAKES ON THE REAR! Took it back to the hotel and thanks to Doug Scribner, Mark was able to get the proper cylinders and Paul Strieby installed them while Mark went to a meeting. It was an experience that I don't want to do again. Yet another reason you don't want to put disc brakes on the rear of a Mini or a Moke. Just a thought.

I will look to see, but I am pretty sure he is used dot 4 already.  I will look to see what he has in the cabinet I mean.

Have not seen stainless lined  cylinders but if you are replacing the cylinders then it is a good time to switch to silicone brake fluid. Regular brake fluid absorbs water and the water weighs more . As a result water ends up in the cylinders and they rust and fail. There are several opinions on whether or not to use it. Our experience has been positive.
Deb

Does anyone sell stainless lined wheel cylinders for the mini, It's the fix for old cars that sit. I have used them on a old beetle, and early mustang 4 piston Calipers.

Because the cars 'sit'  moisture + rust doesn't let the Cylinders last forever.

Since you'll be opening up the system, you should go ahead and do all Six Cylinders.
 
4 Fronts Needed (twin Leading shoe cylinders)  2 of each
 
https://www.minimania.com/part/GWC104-REP/Classic-Mini-Wheel-Cylinder-Right-Front-Twin-Leading-68-84

https://www.minimania.com/part/GWC105-REP/Classic-Mini-Wheel-Cylinder-Left-Front-Twin-Leading-64-84


and 2 rears should go ahead and do if you have the time =  they should be early 5/8ths bore cylinders (measureing before ordering is cnfirming)

https://www.minimania.com/part/GWC1101/Classic-Mini-Brake-Wheel-Cylinder-Rear-5-8-Up-To-1967

make sure the adjusters are free while in there.

 also would think the brake hoses are A/OK from the earlier restoration .. consider replacement if they look  'cracked/or worn"

So there are 6 then because I have had the drums off in front.  Front left is leaking for sure.  Mind as well do them all, because of how often the car stays in the same spot. 
Although the Optima Red Top has been giving me trouble lately "Barb" still starts right up.  (While I jump it!)
Thanks for the help, Alex.

You need to check if there are two or four cylinders at the front (obe or two either side) for twin leading shoe or single leading shoe.  The rear only has one either side.
Diameter of the pistons is fixed I think depending on application.

Does anyone remember what I need to replace all 4/8 cylinders?  Drums all the way around, built 67' and restored 2009.  What measurements do I need in order to give you a clue?  Needs to be at Mom's house by Friday.