Huh. On my Vortec VC's I've got standard parts house caps (Spectre?) and a K&N breather. They were a tight fit but worked fine. I did get a little weepage from one of the caps but a quick skim of RTV on the grommet fixed that up.
Edit: The only larger grommets I'm finding are either 1.25 OD or 1.5 OD. Damn.
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