The rebuild kit shown above is primarily for the open drive line (55 up) version as it has the rear housing gasket and rear seal. The other components are likely the same. Be aware that the brass syncro rings are pressed in and then staked in 4 places to press the brass into small holes in the drum. This is likely a factory press operation as the holes in the 3rd gear end are blind once the ring is inserted.
It could be a challenge replacing them. I would be interested If someone has successfully done this operation.
Fred
