Ef/El diffs they are 28 spline correct and how many bolts are the crown gears 9 or 10?

They are 28 spline and have 8 bolts for the crown wheel.

Ok cool thanks do you think lokka make a centre to suit?

Better off with an LSD.....I bought a brand new centre for $500....28 spline, 4 pinion LSD.

 

 

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you can get a lokka, but they ive read that they make a terrible noise and arent reliable, ie they dont lock properly sometimes or unlock etc, or there are more expensive ones out there that are a quieter,better type, but unless your using it for a powerful car, or track work an lsd is your best option , dont bother with a minispool they are crap for every day driving as well and ilegal