Brewzilla
Brewzilla (Robobrew) Replacement Lid Knobs (Set of 2)
$9.99
Replacement Plastic Knobs for Robobrew 35L Lid (Pair)
This is sold as a pair of 2 knobs. They fit the glass lid that comes with the Robobrew 35L.
These replacement knobs include the phillips head screws too.