Has anyone used old or new style Beetle lights on their Locost? It stuck me that the typical rear wheel arch is curved like a Beetle, and either the large old-style ones (big round units) might fit on the wheel arch, or the new style ones might fit flush-ish.

For SVA presumably the new ones would be OK - not sure about the old ones

I think clearence for the rear of the light may be an issue...

angles wrong (7 is more upright)

Have you thought of using Morris Minoe ones ?
best wishes
Iain