I don't think I've ever seen one for sale in the UK? (Correct me if I'm wrong). This is an Ultra Rare factory optional extra from Japan, a rear window privacy blind which fit S14's. It fits on the inside of the rear window. There has been only a couple ever posted for sale on the USA forum Zilvia (this one sold within a few days at $450 US) KS SUPER RARE OEM JDM Optional S14 Rear Window Shade Price Shipped - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum £380 collect only (located near Portsmouth), or make me an offer. The price really depends on supply/demand for things like this. If you want a very rare piece for your S14, this is it.
Well it was in the back window so I kind of did, just didn't realise how super rare it was until I consulted the oracle of Nissan treasures.