Romanian Maresal MO-4
Romanian designers produced designs of tank destroyer, very similar to Hetzer designated Maresal MO-4, armed with 75mm Resita M1943 gun (based on both Soviet 76.2mm ZIS-3 and German 75mm Pak 40 guns). The vehicle itself was based on captured Soviet T-60 chassis just as previous designs designated M-00, M-01, M-02 and M-03.
In December of 1943, plans were presented to German designers, who then utilized some of its features in Hetzer’s development. In March of 1944, Maresal’s development was continued due to Fuhrer’s support and further variants MO-5 and MO-6 were planned. In May of 1944, prototype of Maresal MO-4 was produced and after extensive tests it proved to be better than German Sturmgeschutz III(40) Ausf G and 75mm Resita M1943 gun proved to be better than German 75mm Pak 40 gun. Right away 1000 vehicles were ordered to be produced by Rofiger works. It was also planned to start production at plants both in Germany and Romania.
In June of 1944, Germans also proposed to produce Flakpanzer Maresal.
In August of 1944, first pre-production series of 10 was produced along with prototype of Maresal MO-5. Further production did not take place since Romania was "liberated" by the Red Army and on October 26th of 1944, Russians ordered all existing vehicles and prototypes to be scrapped and cancelled entire project.
http://www.achtungpanzer.com/jagdpanzer-38t-hetzer.htm