An assembly includes a support and drive assembly, a first structure and a second structure. The first structure is in operable communication with and supported by the support and drive assembly. The first structure includes at least one needle assembly and is adjustable to receive a plurality of needle assemblies. The second structure is supported by the support and drive assembly. The second structure includes at least one seal assembly and is adjustable to receive a plurality of seal assemblies. A method includes determining a number of vials that are to be filled concurrently and adjusting an assembly to include at least one needle assembly and at least one seal assembly. A number of the needle assemblies and the seal assemblies equals the number of vials.