My U.S import 70 had passed its test every year until one mot tester picked up the red rear lenses. I had to replace them but never mentioned side markers and are still as yours.
Ive seen them on ebay too but :
http://www.thezstore.com/page/TZS/PROD/classic02m18/33-1168A
http://www.thezstore.com/page/TZS/PROD/classic02m18/33-1168B
As above, you don't need a reverse. You could put dual lamps in so that they're reverse and indicators. This would need leds though. I think the US lights look nice on the 240's.