vlsd in n15 1.6

I currently use an n15 in khanacross just wondering if it is possible to to fit the n13 vlsd box into an n15 1.6

Need to find a 31V box - best bet in NZ. Not sure about N13's... other option is Phantom Grip if they still make them... or just weld it up if your rule book allows it.

Thanks they are options I use a vlsd box with sr 20 in an n14 on tarmac and it works well enough for hillclimb ,gymkhana etc and was wondering if the n13 box was the 31v and may be bolt on ga16 bellhousing but highly unlikley it would be that easy .