the plastic screw fitting on the passenger side (R) lens housing that holds the circuit board to the plastic knob is broken in my 1990 Volvo 740 GL,resulting in the bulbs becoming loose with every bump and the idiot light showing up intermittently.I used some empty instant ramen wrappings to stabilize the circuit board over the last few years.But it is not working lately.Super Clue repair to the plastic screw housing did not work either.

So it seems like its time to change the whole housing.Eeuroparts and fcpgroton both supplies the lens only not the circuit.

On ebay there are two sellers of these units,complete with circuits.

How do these fit if I just replace one side?

(1)Does it fit well on itself?

(2)is it better to change in pairs for esthetic reason?

Thanks for any comment