This was topic recently discussed on another forum, here is part of the discussion.
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The Super Safety model, or SS, was sold in the US from 1967 to July 1968. It was an updated S3 Elan, introduced to meet new US safety and polution legislation, which came into effect from January 1968.
At this time all Elans sent to the US were Special Equipment models. The changes to begin with were additional padding to the dashboard surround. This was followed later by replacing the toggle switches with the rocker style (later seen across the range in S4 and +2 elans), the BMC flush-fit door handle, hazard light switch, brake fluid warning light and the repalcement of knock-off wheel nuts with the earless type. In addition, dual circuit braking was fitted and an air injection system, along with the wide ratio gearbox and the 3.55:1 diff.
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In addition to this some cars had the three ears of the knock on wheel nuts turned inward.
There was a SS Elan on ebay recently,try doing a search useing number 4587376459 if it doesn't work I can send you some pics if you supply your email address.
Brian