I have 99 Honda Accord EX (ULEV), the engine is F23A4, the head is cracked. The cast number is PAA-3 (PAA-HA-3). I tried to look for another head, but i could not find one. Can anyone here help me to find one that match my cylinder head please. I just found one that is PAA-4 for 2002 Honda Accord EX, and the they said that it doesn't match with PAA-3. Is this right? Can i replace it with PAA-4?