As a condition to the certification of any motor vehicle pollution control device required under this chapter, except Section 43630, the manufacturer of such a device, in order to protect the public interest, shall agree to either of the following:

1. (a) That, until two or more such devices are certified for the same subclassification of motor vehicles, he enter into such cross-licensing or other agreements the state board determines, after a public hearing, are necessary to insure adequate competition among manufacturers of such devices.
2. (b) That, if his device is the only one made available to the public, the retail price of the device, including installation, does not exceed the price established, after a public hearing, by the state board for that device.