The Lotus Grand Tourers

I foolishly snapped off the passenger side wing mirror this afternoon whilst lumbering around carelessly. My Eclat S1 has manual mirrors and the metal mounting point on the door is undamaged. The only part that is broken (other than the glass, since I started playing with it!) is the plastic mounting point on the mirror case. Where can I get a new one? I've already asked Mike Taylor and I'm waiting for his reply but these old Raydyot items don't seem very common.

Any help gladly appreciated.

Still looking... anyone able to help? These things appear to be rarer than hen's teeth!