I believe there was a driveshaft rebuild kit listed for the rear of the original RB5 but can't remember the full number. This came with an axle, the pivot boss, grub screw and the pin.
I am not aware of the pins being listed separately but they might well appear under general hardware by their dimensions rather than as a part reference to the driveshaft.
In the past, at a push to keep going, I've cut down a drill bit shank and used that but there is no substitute for a pin of the correct spec.
When you rebuild your driveshafts clean everything with solvent and use a good quality low strength thread lock, a 242 is perfect.
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