Installing a pioneer stereo in a 1995 honda civic

Question

i only have 2 wires left which are the black wire which has a hook for a s***w which is the ground and a blue wire with a white stripe, the end has  a clear rubber connector it also has a tag on it that says system remote controll
on the directions it says connect the black wire to the chassis of unpainted metal. what if i can not find metal to attach the ground then where do i connect it to shouldnt i just connect it to the black ground wire of the car?
 the blue wire has a connector do i just connect that to the solid blue wire of the car which says power antenna