Actually this is the "FSDZigns Team C121A Constellation MATS" Vintage Propliner, Complete with A Good Virtual Cockpit, in really decent detail.
I remember grabbing it off a MATS Web Site soley dedicated to MATS, but I'm unable to find that web site now.
Best I can do is the web link below,,
Notice the nose of this C121A Lockheed is NOT painted Black, like that one from Manford John
Also Notice the great SHINE & Reflections upon the Fuselodge too, unlike that other by Manford John
and the Windows are way better too ~ !!!
I believe , and I can't remember, as I have close to 5,000 Aircraft with in my FSX Gold edition,, you have to download the BASE PACK 1st, and then grab the MATS paint - I think

?
MATS C121A is at the very bottom of the page, in the Link below.
Also below the 1st Link, is more Links from the "FSDZIGNS" Team and more of these "FREEWARE" L-1049's ~ !!
Best I can do ya,,, Jetranger
http://www.simnetwork.com/SIMNETWORK/downloads.php?cat_id=26&rowstart=654 More Links for the "FSDZINGS" - Lockheed L-1049's /// 3 Pages worth of these Very Nice "FREEWARE" Aircraft !
If it doesn't pull up - Type in the Search of their web site "FSDZigns Lockheed 049A".
Link :
http://www.flightsim.com/vbfs/fslib.php?searchid=12219981 Also- Simvation :
http://simviation.com/1/search?submit=1&keywords=FSDZIGNS&x=21&y=13
