curious to know if the perspex strip with the third light is meant for non turbo version cars because of not having a spoiler? asking because ill be getting a new spoiler which doesn't have a third light or space for it and not sure if its a legal requirement in the uk to have a third light.

It is not a legal requirement for a third brake light in the UK.

Don't have a clue about the other questions you asked though.

Think the break light is just extra, or more likely the non break light version was Nissan cutting back on costs.

 

ive seen smooth boot lids and spoilerd ones with and without it.

the strips without the brake light sold by dealers or zcentre is there room for adding or modding the third light? for instance its the same just not housing unit for the light or is it one solid plastic piece?

Nissan dealer quoted 157 inc vat for third brake light strip and without brake light 55!!!

 

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My '93 Series 2 UK came without the center brake light and Nissan didn't even bother putting the loom to it either. The tight gits :rant: ;)