XC-54K conversion. Real C-54 c/n ?

Hi all

Please, anyone knows which was the sole C-54 used as test example of long range, fitted with Wright R-1820 ?

I have checked the Baugher´s site and mention two aircrafts:
– 42-72176 c/n 10281
– 42-72484 c/n 10589

I have the USAF records of the second ac and it was delivered to USAAF on feb 1944 being leased to RAF on the next month. No mention that it was converted to XC-54K.

Thanks guys
Cheers
Michel