There is also a guy who sell on Ebay UK under the name 'Parts from Cyprus' or something like that. He occasionally lists these and the red rear lenses too.
http://myworld.ebay.com/partsfromcyprus/
Yes, I bought a set of red lenses NOS very reasonably from him + he had the bulb holder/base assemblies NOS too
http://www.ebay.com/itm/110798302628?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
Worth asking him as he has a lot more parts than he lists
GW