I figured the 9 inch thing out .
Thanks for the help 
You should add if you are only looking for an original 68 9" rear for doing a 100 point restoration or if you are just looking for a 9" rear for doing a restomod or hot rod. If you are doing a restomod/hot rod then you can use a 69-70 9" rear as it will bolt right in.
Randy Goodling
CCOA #95
And where would I find a rear for those years ?
If you are asking about the 69-70 rears every 69-70 Cougar built left the factory with a 9" rear.
Randy Goodling
CCOA #95
Thank you .
I’ll look for those .
You can get a new 9 inch with 31 spline axles fairly cheap. Speedway, Quick Performance…etc same year mustang . If you order Quick performance from Amazon, you’ll get it faster. I recommend them, I’ve purchased 3 rear ended with axles and 3 complete 3rd members. They have all been quiet and they get used!!,
have a complete 68-70 one in northern NY. $500.
To far , shipping would be really high im thinking.