The MicroSolv catalog number you will need for 20mL vials is 95040-SB1: “Storage Box / Rack with cover, PP, for 20ml EPA / VOA vials, violet, 130mm x 130mm x 102mm. 16 cavities.”
There is also a rack suitable for headspace autosampler vials. The part number here is 95025-SB: “Storage Box / Rack with cover, PP, for headspace vials, blue plastic, 130mm x 130mm x 102mm. 25 cavities.”
Click HERE for autosampler vial storage rack ordering information and pictures