Right I have confirmation that the Cusco is rear only. Never has been front and never will be.
The ebay seller never got back to me but the guy from Nengun contacted cusco and got confirmation.
"Cusco LSD Rear for RNN14 - made to order 3 months.Note: When it fits on RNN14, the below side shaft 39711-64E06 needs to be installed But it was discontinued already. So customer has to find it with used parts.
Cusco does not make a front LSD for RNN14. "
Cusco one is £638.94 +shipping tax etc which by my calcs is about £850 delivered in UK.
The part number above is for a left hand inner tripod drive joint thing. I think you simply use a LH joint on both sides of the diff. Number 2 on this:
Cusco don't have any but nissan might. And I'm pretty sure many owners will have them lying around spare and fairly worthless...
I have contacted Modena they said -
We did make those diffs but unfortunately we sold out and I’m unsure at this stage if they will be remade. Maybe check back in a month or so after we have planned our production schedule.
I wrote back and asked if I can generate some interest will this help your descision? I will let you know what she says.
I will start a separate thread so other people will pick up on it.