
well, at least you got part of it right...the u (umrust-bausatz) and r (ruestsaetze) designations were conversion kits, usually combat mission specific armaments. the /u were factory and the /r were field.
so, since we have several /u and /r kits for the 190a5, 190a8, 190f8, 190d9 available in the hangar, which ones are you wanting?