Strange that the West never fielded a tracked air defence system less the Gepard when the Soviet Bloc had the ZSU-24 and later the 2S16 Tunguska.
There was the ill-fated US Roland programme in the late 1970s in which the European SAM system was extensively redesigned at subsystem/module level to conform to US engineering practice. The entire project was steadily given the budgetary 'death of a thousand cuts' until only a handful of units were built and issued only the National Guard.