Need valves for F20A DOHC

[prelude_guy]

My timing belt went while drving and the mechanic said valves were bent. Heres my problem, my engine is the F20A DOHC 150HP AUTOMATIC, the mechanic said he is having a hard time finding valves that would fit this engine I've check with the place where the engine was bought but no luck so far. Does any one here know which could possible fit this engine.

I have a prelude 94si automatic.

thanks in advance for any help