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The grommets are available from McMaster Carr, item #9600K31 "Push-in Grommet, 5/16" ID, 5/8" OD, 1/16" Thickness for 1/2" Diameter Panel Hole, packs of 100". $6.89 for 100.
Probably have to salvage the little steel piece from a parts truck.
Hope this helps.