These are rubber PCV valve grommets. Get the PCV Valve here.
Groove on outside of grommet is approximately 1/8 inch deep making the diameter at the groove approximately 1 inch,
Outside diameter is approximately 1.25 inches.
Inside diameter is approximately 0.75 inches.
Groove height on the two grommets are approximately 3/16" and 5/16".
Give us a call with any questions at (602)850-7399.