LSD questions!

[gambate]

the oem LSD pic i posted is not ITR/CTR LSD. its the "optional" B16a lsd (pending confirmation from those that has seen it before)
it has 14 bolts pattern. i believe all ITR/CTR LSD is 10 bolts.

so now we have 2 variable:
1. ID of FD ring gear
2. bolts pattern on LSD / FD ring gear

b16 to fit a ITR/CTR LSD: need to change the final drive/ring gear is because of variable no1 (afaik).

i need to know more about variable no2:
is this 14 bolts pattern only unique to these "optional LSD b16a" gearbox or not?

open diff b16: ID of FD? bolt pattern of FD?
oem LSD b16a:ID of FD? bolt pattern of FD?
open diff b18:ID of FD? bolt pattern of FD?
oem LSD b18: ID of FD? bolt pattern of FD?
etc etc