73 Camaro wiper arm
 

I have a 1973 Camaro Z/28 that has standard wiper arms on it. I say this because the wiper motor is square and not rounded like the hidden wiper motor. Also there is no post on the left side to attach the extra arm that is on the hidden arm. Does anyone know where I can buy a set of standard replacement wiper arms? All I can find are the hidden wiper arms with the extra arm.