r200 into open pumpkin?

[Cubantunr]

Looked around just wondering if this will swap directly into my 92 s13 pumpkin which is open diff. or will i need modifying.
reason im asking is because theres two different kind this one is 12mm and other is 13mm i have no clue what bolts theyre talking about.

JDM Silvia R200 Viscous LSD s13 SR20DET 12mm Differential Rear Slip Kits Nissan | eBay (http://www.ebay.com/itm/JDM-Silvia-R200-Viscous-LSD-S13-SR20DET-12mm-differential-rear-slip-kits-Nissan-/271283365675?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f29bfa72b&vxp=mtr)

[jr_ss]

You have an R200. What you are asking is if a factory VLSD will fit into it.

Answer; if you have the matching axle stubs, yes it'll bolt it, but needs to be shimmed properly.

12mm vs 13mm is referring to the ring bolt size. You need the 12mm ring bolt.