We have a lot of 3 Valve covers Vintage Items.  The white one measures about 2 1/4" x 1 7/8" across x about 3/4" in D.  The large round one with numerous squares around the outer rim measures about 2 3/8" across the center x about 3/8" in D.  The last one with 5 openings around inside measures about 2 1/4" across x about 1/4" in D.  They all have vintage patina's with some light rust.