I know that this might not be the right subforum but I figured yall might a bit more experience since you have more access to Skylines. I am looking at importing an r180 LOM55 LSD from Japan. It seems that from the ads they are being pulled off the KGC10s . I was wondering if the fitment was the same for the 240z, bolt size and axle size, spline count etc. I want to roll with an LSD but don't really have the power to justify swapping to a R200. 

An R180 is quite fine running all day at the track with 325+hp.

Can I ask what the import cost of the LOM55 diff will be?

What gear ratio?

They are selling under 300 dollars, shipping will cost quite a bit. My best guess is 400 total.  I was planning on locating some 3.9 gearing for it. I have seen some ads that show it labled as for s30 and KGC10. Figured it must be the same long nose lsd for both but wanted to make sure.