How much does this cost to the nearest dollar?

PAC Premium Amplifier Add-On/Replacement Radio Sound System Interface Kit GM - PAC
PAC Premium Amplifier Add-On/replacement Radio Sound System Interface Kit GM - PAC The factory amp (if equiped) & system will remain unchanged. Interface is transformer isolated, maintains phase and is linear from 20 to 20,000 HZ. This 4 channel interface will allow the output to be adjusted to the input requirements of the new amplifier, providing 2 1 gain and infinite attenuation. The input connectors plug into the factory stereo and vehicle harness. The 4 female RCA output jacks plug for connecting to the new amplifier. Dimensions 15.5 x 2 x 12 inches, Weight 4.8 ounces, model number Rank Electronics Car Amplifiers 812, Is

Price is $51.00

Price: $50.99