Kanter has some repro rubber items which at one time he said were not made by Steele. No idea if he has what you need though.
MetroMolded
http://www.metrommp.com/ has a few items they say are Packard specific and quite a bit of universal items including grommets. You might find one of those grommets that works for what you need. Otherwise, AFAIK Steele is the only other game.
Which grommets are you looking for. If they are not terribly specific, McMaster has a fairly good selection of regular types that might work in a pinch.
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