I'm getting close to opening up my 915 transmission to to some work, and while it's open, I'm wanting to swap out the current 5th gear (.82) with a taller gear.

The way the car is right now, the engine is turning 4000rpm cruising down the interstate at 75 mph.

I'd like it to be more relaxed. So, that's why I'm hoping that some will have this gear set sitting around somewhere not being used, and ready to pass is on.
This gear set is from early mag cased 915's if I'm correct. say 915/08'ish.
PM, EM, or post. I read'em all

Thanks in advance..