Ive seen on some cars (mainly JDM cars) that the rear units have a clear indicator unit rather than the UK amber unit.

Are these readly available and are they are direct swap bewteen early/late and UK/JDM models?

Classic, I assume?

STI rears mate, readily available.

I got mine from here a couple of years ago;

STI Rear Tail Lights Subaru Impreza 92-00 Flat4online.co.uk Subaru Impreza Mitsubishi Evolution EVO Walbro Fuel Pumps Injectors Intercoolers (http://www.flat4online.co.uk/catalog/product_info.php?pName=sti-rear-tail-lights-subaru-impreza-9200)