AS Reed Valve

I have a '92 4runner and I just discovered that the screws in the AS (Air Suction) reed valve have fallen out and the two halves came appart exposing the gasket. Is there anything special I must do to fix, or can I simply replace the new screws and tighten?...It seems to be spring loaded. or Is it necessary to replace the AS Reed Valve assembly with a new one?



Anyone know what size screws to ask for.

Phoned Toyota parts dealer and they were no help.

Thx for any advice