Renault UN diff options - killed my plate diff already...

As above, looking for anyone that either has an idea's, pointers or even a diff around for a UN transaxle.

Basically I fitted an Elite plate diff but it lasted about 3 days and just grenaded itself and took the gearbox out with it - it just wasn't up to the job with the smaller spiders it has than the standard UN5.
I'm looking to see if you guys know of either a stronger plated diff, or whether anyone has a UN torsen around - or an option for a one off (last time I talked to quaiffe they weren't interested unless you bought 10) it's not going to be as good for locking I know but I'd assume a Torsen is going to be a much stronger unit.