Yes, K20A LSD will fit. You might or might not need to shim it to get it to fit perfectly depending on which car the LSD came out of. Don't need the speed sensor gear since the CL9 uses wheel speed sensors.
Make sure you the LSD from a DC5R or a CL7 Euro R. Wouldn't make sense to take the diff from a regular DC5 since that is an open diff.
With regards to synchros, it won't fit because the CL9's gearbox uses triple cone synchros for some gears.
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