Front locking diff code for 5.43 ratio (ex telecom syncro)

Thanks to all who have contributed to help me find a solution to my quest to get a locking
Could someone with ETKA or some code breaker please inform me of the code /
serial number of a 5.43 ratio locking front diff to replace my non difflock version
serial no. 6N/D. Is it possible to purchase a locking unit of a different ratio or worn out
ring and pinion and transfer the ring and pinion from my good unit over to the locking
unit. I am aware of the different internal parts, but can maor components such as ring and
pinion be changed over?