Drum brake cylinder rebuild kit: Can I use the later ones?

[BoldUlysses]

My Z is a 7/72 build; however, it has the (from what I gather) earlier braking system, with the drum brake cylinder assemblies whose hard line comes out the front, as opposed to the side. Pre-mid-72 wheel cylinders seem to be at least twice as expensive as the later ones, if they're even available at all.

That being said, can I buy a rebuild kit for the later cylinders and use it on my early wheel cylinders? How similar are the internals? Anyone done this?

Thanks guys.

[BoldUlysses]

Quick update: The later rebuild kits are compatible with the earlier cylinders; all the seals and clips fit fine during my recent rebuild.

Also, tidbit from Oliver of Z Specialties: Apparently it's easy to swap (rare and expensive) pre-mid-72 drum brake innards for (more common and slightly cheaper) later drum brake parts. Get the later brake bridge so that it will mate with the new location of the brake line entering the wheel cylinder; the backing plates are common between the two styles.