The MicroSolv catalog number you will need for 20mL vials is 95040-SB1: “Storage Box/Rack w.cover, PP, for 20ml EPA/VOA vials, violet, 130mm x 130mm x 102mm. 16 cavities.”

There is also a rack suitable for autosampler vials. The part number here is 95025-SB: “Storage Box/Rack w.cover, PP, for headspace vials, blue plastic, 130mm x 130mm x 102mm. 25 cavities.”

Autosampler Vial Storage Rack Product Page