What does the back of the USB socket look like? Can it be wired to a stereo that supports USB inputs so you can charge the device and do music playback?

• Do you need to change the Is proportioning valve if I have disc in front? general
• Do I still use the spacer if I use your heavy duty axle retaining plate? The instructions appear to depict using the sp install
• Do you sell longer T-bolts to compensate for the extra thickness of the primary mounting plate? Once I install the prim install