grommet problem

[76bonanza]

In an effort to solve my oil in breather problem I went looking for grommets as an easy solution. I have morrso valve covers just stamped steel I think painted to match truck no baffles. At napa I found two grommets one with a baffle build into the grommet and one I can cut my self both say fit 1 1/4 holes. Anyway when I get home both are to loose dont fit tight at all. Is there a wider valve cover hole than 1 1/4 or were these just poorly made?( mr gasket).

Thanks