rear light

http://www.ebay.co.uk/itm/361070387774?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT These are only £24 landed here in the UK, I wondered if anyone has tried them before? I tried a search, and nothing came up. It says no glue needed, so I guess they just compress when you bolt...