Series 4, 5 & 6 wheel cylinders should all be the same, as long as they are still stock. The shoes and drums could be different, and the hubs might be different, 5/10 lug vs 6 lug. You need to do a side by side comparison to be sure.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD