I happened to check the top loader for my '65 R-model replica today. It's an HEH-T which is correct for an early Hipo mustang (too bad it's not an aluminum case - wishful thinking.....lolol). It's rebuilt with less than a thousand miles on it.
I'd be willing to trade for a comparable rebuilt HEH-BX if anyone's interested. I want a Hipo tranny for my '65 but it doesn't have to be this one, especially if it'll help someone further a correct k-restoration. It's not for sale outright, only for trade. Exception would be cost to purchase another -BX that's available from a third party. Otherwise, it'll be going back in my '65 within the next few months.
Mark