Drive Shaft ID- strange

[Chino 240Z]

Zed owner in needs help with ID on this broken drive shaft. The shaft in question was for a 78 280 with a 5 speed manual tranny (at least that is what he thought he had). When he purchased a drive shaft thinking they were all the same but found that the new shaft was about 3cm or less than 1" too short and the splines did not match output shaft. He sent a drawing explaining the splines & length, I can't recall ever seeing this type splines before? Trans & shaft may been swapped from previous owner? Any ideas? I told him someone here may have seen this and Iwould pass it along.

Thanks

Craig

Are T5 trans output shaft splines different?

[Chino 240Z]

Well, another drive shaft was found in a stack of shafts so broken down party won't need to walk any more. Still don't know what the heck it was, but a matching spline- shaft was found. Oh well, no big deal.