passive crossover question

i need to make 2 mono 2 way passive crossovers to complete my system. what i want is a crossover that crosses at 6500 hz with a 12 db slope, though a 6 db slope would be ok and will have a 4 ohm tweeter and a 4 ohm midrange hooked to it. can anyone tell me what capaciter and choke i need to make this and where i might go to get them as well as the correct wiring diagram? there are a couple of electronics places in town where i should be able to get the right stuff but they may not have the chokes. tia