Robert,
In effect it's based on a t-54/55 so...the upgrade,referring to the armour blocks,is the same in both version of the tank.
But,if you want depict it correctly I think that you need choose a precise version
T-54u
T-55a
I can say that refferring to my references,then you can go on with the upgrade...and yes,this tank was used only by iraqi forces..if I'm not wrong Iraqi army built about 300 of these....
Anyway,I repeat,your link is very usefull to get all little details that are in commons between the two versions of t54/55 base...Thanks!!!!!
Have a nice day Robert!!!!!!
Warmest Regards
Ciro Riccio